1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 296fd7ce5SGreg Kroah-Hartman /* 396fd7ce5SGreg Kroah-Hartman * Copyright (C) 1991, 1992 Linus Torvalds 496fd7ce5SGreg Kroah-Hartman */ 596fd7ce5SGreg Kroah-Hartman 696fd7ce5SGreg Kroah-Hartman /* 796fd7ce5SGreg Kroah-Hartman * 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles 896fd7ce5SGreg Kroah-Hartman * or rs-channels. It also implements echoing, cooked mode etc. 996fd7ce5SGreg Kroah-Hartman * 1096fd7ce5SGreg Kroah-Hartman * Kill-line thanks to John T Kohl, who also corrected VMIN = VTIME = 0. 1196fd7ce5SGreg Kroah-Hartman * 1296fd7ce5SGreg Kroah-Hartman * Modified by Theodore Ts'o, 9/14/92, to dynamically allocate the 1396fd7ce5SGreg Kroah-Hartman * tty_struct and tty_queue structures. Previously there was an array 1496fd7ce5SGreg Kroah-Hartman * of 256 tty_struct's which was statically allocated, and the 1596fd7ce5SGreg Kroah-Hartman * tty_queue structures were allocated at boot time. Both are now 1696fd7ce5SGreg Kroah-Hartman * dynamically allocated only when the tty is open. 1796fd7ce5SGreg Kroah-Hartman * 1896fd7ce5SGreg Kroah-Hartman * Also restructured routines so that there is more of a separation 1996fd7ce5SGreg Kroah-Hartman * between the high-level tty routines (tty_io.c and tty_ioctl.c) and 2096fd7ce5SGreg Kroah-Hartman * the low-level tty routines (serial.c, pty.c, console.c). This 2196fd7ce5SGreg Kroah-Hartman * makes for cleaner and more compact code. -TYT, 9/17/92 2296fd7ce5SGreg Kroah-Hartman * 2396fd7ce5SGreg Kroah-Hartman * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines 2496fd7ce5SGreg Kroah-Hartman * which can be dynamically activated and de-activated by the line 2596fd7ce5SGreg Kroah-Hartman * discipline handling modules (like SLIP). 2696fd7ce5SGreg Kroah-Hartman * 2796fd7ce5SGreg Kroah-Hartman * NOTE: pay no attention to the line discipline code (yet); its 2896fd7ce5SGreg Kroah-Hartman * interface is still subject to change in this version... 2996fd7ce5SGreg Kroah-Hartman * -- TYT, 1/31/92 3096fd7ce5SGreg Kroah-Hartman * 3196fd7ce5SGreg Kroah-Hartman * Added functionality to the OPOST tty handling. No delays, but all 3296fd7ce5SGreg Kroah-Hartman * other bits should be there. 3396fd7ce5SGreg Kroah-Hartman * -- Nick Holloway <alfie@dcs.warwick.ac.uk>, 27th May 1993. 3496fd7ce5SGreg Kroah-Hartman * 3596fd7ce5SGreg Kroah-Hartman * Rewrote canonical mode and added more termios flags. 3696fd7ce5SGreg Kroah-Hartman * -- julian@uhunix.uhcc.hawaii.edu (J. Cowley), 13Jan94 3796fd7ce5SGreg Kroah-Hartman * 3896fd7ce5SGreg Kroah-Hartman * Reorganized FASYNC support so mouse code can share it. 3996fd7ce5SGreg Kroah-Hartman * -- ctm@ardi.com, 9Sep95 4096fd7ce5SGreg Kroah-Hartman * 4196fd7ce5SGreg Kroah-Hartman * New TIOCLINUX variants added. 4296fd7ce5SGreg Kroah-Hartman * -- mj@k332.feld.cvut.cz, 19-Nov-95 4396fd7ce5SGreg Kroah-Hartman * 4496fd7ce5SGreg Kroah-Hartman * Restrict vt switching via ioctl() 4596fd7ce5SGreg Kroah-Hartman * -- grif@cs.ucr.edu, 5-Dec-95 4696fd7ce5SGreg Kroah-Hartman * 4796fd7ce5SGreg Kroah-Hartman * Move console and virtual terminal code to more appropriate files, 4896fd7ce5SGreg Kroah-Hartman * implement CONFIG_VT and generalize console device interface. 4996fd7ce5SGreg Kroah-Hartman * -- Marko Kohtala <Marko.Kohtala@hut.fi>, March 97 5096fd7ce5SGreg Kroah-Hartman * 5196fd7ce5SGreg Kroah-Hartman * Rewrote tty_init_dev and tty_release_dev to eliminate races. 5296fd7ce5SGreg Kroah-Hartman * -- Bill Hawes <whawes@star.net>, June 97 5396fd7ce5SGreg Kroah-Hartman * 5496fd7ce5SGreg Kroah-Hartman * Added devfs support. 5596fd7ce5SGreg Kroah-Hartman * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 13-Jan-1998 5696fd7ce5SGreg Kroah-Hartman * 5796fd7ce5SGreg Kroah-Hartman * Added support for a Unix98-style ptmx device. 5896fd7ce5SGreg Kroah-Hartman * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998 5996fd7ce5SGreg Kroah-Hartman * 6096fd7ce5SGreg Kroah-Hartman * Reduced memory usage for older ARM systems 6196fd7ce5SGreg Kroah-Hartman * -- Russell King <rmk@arm.linux.org.uk> 6296fd7ce5SGreg Kroah-Hartman * 6396fd7ce5SGreg Kroah-Hartman * Move do_SAK() into process context. Less stack use in devfs functions. 6496fd7ce5SGreg Kroah-Hartman * alloc_tty_struct() always uses kmalloc() 6596fd7ce5SGreg Kroah-Hartman * -- Andrew Morton <andrewm@uow.edu.eu> 17Mar01 6696fd7ce5SGreg Kroah-Hartman */ 6796fd7ce5SGreg Kroah-Hartman 6896fd7ce5SGreg Kroah-Hartman #include <linux/types.h> 6996fd7ce5SGreg Kroah-Hartman #include <linux/major.h> 7096fd7ce5SGreg Kroah-Hartman #include <linux/errno.h> 7196fd7ce5SGreg Kroah-Hartman #include <linux/signal.h> 7296fd7ce5SGreg Kroah-Hartman #include <linux/fcntl.h> 733f07c014SIngo Molnar #include <linux/sched/signal.h> 7429930025SIngo Molnar #include <linux/sched/task.h> 7596fd7ce5SGreg Kroah-Hartman #include <linux/interrupt.h> 7696fd7ce5SGreg Kroah-Hartman #include <linux/tty.h> 7796fd7ce5SGreg Kroah-Hartman #include <linux/tty_driver.h> 7896fd7ce5SGreg Kroah-Hartman #include <linux/tty_flip.h> 7996fd7ce5SGreg Kroah-Hartman #include <linux/devpts_fs.h> 8096fd7ce5SGreg Kroah-Hartman #include <linux/file.h> 8196fd7ce5SGreg Kroah-Hartman #include <linux/fdtable.h> 8296fd7ce5SGreg Kroah-Hartman #include <linux/console.h> 8396fd7ce5SGreg Kroah-Hartman #include <linux/timer.h> 8496fd7ce5SGreg Kroah-Hartman #include <linux/ctype.h> 8596fd7ce5SGreg Kroah-Hartman #include <linux/kd.h> 8696fd7ce5SGreg Kroah-Hartman #include <linux/mm.h> 8796fd7ce5SGreg Kroah-Hartman #include <linux/string.h> 8896fd7ce5SGreg Kroah-Hartman #include <linux/slab.h> 8996fd7ce5SGreg Kroah-Hartman #include <linux/poll.h> 9096fd7ce5SGreg Kroah-Hartman #include <linux/proc_fs.h> 9196fd7ce5SGreg Kroah-Hartman #include <linux/init.h> 9296fd7ce5SGreg Kroah-Hartman #include <linux/module.h> 9396fd7ce5SGreg Kroah-Hartman #include <linux/device.h> 9496fd7ce5SGreg Kroah-Hartman #include <linux/wait.h> 9596fd7ce5SGreg Kroah-Hartman #include <linux/bitops.h> 9696fd7ce5SGreg Kroah-Hartman #include <linux/delay.h> 9796fd7ce5SGreg Kroah-Hartman #include <linux/seq_file.h> 9896fd7ce5SGreg Kroah-Hartman #include <linux/serial.h> 995a3c6b25SManuel Zerpies #include <linux/ratelimit.h> 100e2112038SAl Viro #include <linux/compat.h> 10196fd7ce5SGreg Kroah-Hartman 10296fd7ce5SGreg Kroah-Hartman #include <linux/uaccess.h> 10396fd7ce5SGreg Kroah-Hartman 10496fd7ce5SGreg Kroah-Hartman #include <linux/kbd_kern.h> 10596fd7ce5SGreg Kroah-Hartman #include <linux/vt_kern.h> 10696fd7ce5SGreg Kroah-Hartman #include <linux/selection.h> 10796fd7ce5SGreg Kroah-Hartman 10896fd7ce5SGreg Kroah-Hartman #include <linux/kmod.h> 10996fd7ce5SGreg Kroah-Hartman #include <linux/nsproxy.h> 11096fd7ce5SGreg Kroah-Hartman 11196fd7ce5SGreg Kroah-Hartman #undef TTY_DEBUG_HANGUP 112accff793SPeter Hurley #ifdef TTY_DEBUG_HANGUP 113accff793SPeter Hurley # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args) 114accff793SPeter Hurley #else 115accff793SPeter Hurley # define tty_debug_hangup(tty, f, args...) do { } while (0) 116accff793SPeter Hurley #endif 11796fd7ce5SGreg Kroah-Hartman 11896fd7ce5SGreg Kroah-Hartman #define TTY_PARANOIA_CHECK 1 11996fd7ce5SGreg Kroah-Hartman #define CHECK_TTY_COUNT 1 12096fd7ce5SGreg Kroah-Hartman 12196fd7ce5SGreg Kroah-Hartman struct ktermios tty_std_termios = { /* for the benefit of tty drivers */ 12296fd7ce5SGreg Kroah-Hartman .c_iflag = ICRNL | IXON, 12396fd7ce5SGreg Kroah-Hartman .c_oflag = OPOST | ONLCR, 12496fd7ce5SGreg Kroah-Hartman .c_cflag = B38400 | CS8 | CREAD | HUPCL, 12596fd7ce5SGreg Kroah-Hartman .c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK | 12696fd7ce5SGreg Kroah-Hartman ECHOCTL | ECHOKE | IEXTEN, 12796fd7ce5SGreg Kroah-Hartman .c_cc = INIT_C_CC, 12896fd7ce5SGreg Kroah-Hartman .c_ispeed = 38400, 129133b1306SPeter Hurley .c_ospeed = 38400, 130133b1306SPeter Hurley /* .c_line = N_TTY, */ 13196fd7ce5SGreg Kroah-Hartman }; 13296fd7ce5SGreg Kroah-Hartman 13396fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_std_termios); 13496fd7ce5SGreg Kroah-Hartman 13596fd7ce5SGreg Kroah-Hartman /* This list gets poked at by procfs and various bits of boot up code. This 13696fd7ce5SGreg Kroah-Hartman could do with some rationalisation such as pulling the tty proc function 13796fd7ce5SGreg Kroah-Hartman into this file */ 13896fd7ce5SGreg Kroah-Hartman 13996fd7ce5SGreg Kroah-Hartman LIST_HEAD(tty_drivers); /* linked list of tty drivers */ 14096fd7ce5SGreg Kroah-Hartman 141d1d027efSPeter Hurley /* Mutex to protect creating and releasing a tty */ 14296fd7ce5SGreg Kroah-Hartman DEFINE_MUTEX(tty_mutex); 14396fd7ce5SGreg Kroah-Hartman 14496fd7ce5SGreg Kroah-Hartman static ssize_t tty_read(struct file *, char __user *, size_t, loff_t *); 14596fd7ce5SGreg Kroah-Hartman static ssize_t tty_write(struct file *, const char __user *, size_t, loff_t *); 14696fd7ce5SGreg Kroah-Hartman ssize_t redirected_tty_write(struct file *, const char __user *, 14796fd7ce5SGreg Kroah-Hartman size_t, loff_t *); 148afc9a42bSAl Viro static __poll_t tty_poll(struct file *, poll_table *); 14996fd7ce5SGreg Kroah-Hartman static int tty_open(struct inode *, struct file *); 15096fd7ce5SGreg Kroah-Hartman long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 15196fd7ce5SGreg Kroah-Hartman #ifdef CONFIG_COMPAT 15296fd7ce5SGreg Kroah-Hartman static long tty_compat_ioctl(struct file *file, unsigned int cmd, 15396fd7ce5SGreg Kroah-Hartman unsigned long arg); 15496fd7ce5SGreg Kroah-Hartman #else 15596fd7ce5SGreg Kroah-Hartman #define tty_compat_ioctl NULL 15696fd7ce5SGreg Kroah-Hartman #endif 15796fd7ce5SGreg Kroah-Hartman static int __tty_fasync(int fd, struct file *filp, int on); 15896fd7ce5SGreg Kroah-Hartman static int tty_fasync(int fd, struct file *filp, int on); 15996fd7ce5SGreg Kroah-Hartman static void release_tty(struct tty_struct *tty, int idx); 16096fd7ce5SGreg Kroah-Hartman 16196fd7ce5SGreg Kroah-Hartman /** 16296fd7ce5SGreg Kroah-Hartman * free_tty_struct - free a disused tty 16396fd7ce5SGreg Kroah-Hartman * @tty: tty struct to free 16496fd7ce5SGreg Kroah-Hartman * 16596fd7ce5SGreg Kroah-Hartman * Free the write buffers, tty queue and tty memory itself. 16696fd7ce5SGreg Kroah-Hartman * 16796fd7ce5SGreg Kroah-Hartman * Locking: none. Must be called after tty is definitely unused 16896fd7ce5SGreg Kroah-Hartman */ 16996fd7ce5SGreg Kroah-Hartman 170a3123fd0SPeter Hurley static void free_tty_struct(struct tty_struct *tty) 17196fd7ce5SGreg Kroah-Hartman { 172c8b710b3SPeter Hurley tty_ldisc_deinit(tty); 17396fd7ce5SGreg Kroah-Hartman put_device(tty->dev); 17496fd7ce5SGreg Kroah-Hartman kfree(tty->write_buf); 17589c8d91eSAlan Cox tty->magic = 0xDEADDEAD; 17696fd7ce5SGreg Kroah-Hartman kfree(tty); 17796fd7ce5SGreg Kroah-Hartman } 17896fd7ce5SGreg Kroah-Hartman 17996fd7ce5SGreg Kroah-Hartman static inline struct tty_struct *file_tty(struct file *file) 18096fd7ce5SGreg Kroah-Hartman { 18196fd7ce5SGreg Kroah-Hartman return ((struct tty_file_private *)file->private_data)->tty; 18296fd7ce5SGreg Kroah-Hartman } 18396fd7ce5SGreg Kroah-Hartman 184fa90e1c9SJiri Slaby int tty_alloc_file(struct file *file) 18596fd7ce5SGreg Kroah-Hartman { 18696fd7ce5SGreg Kroah-Hartman struct tty_file_private *priv; 18796fd7ce5SGreg Kroah-Hartman 18896fd7ce5SGreg Kroah-Hartman priv = kmalloc(sizeof(*priv), GFP_KERNEL); 18996fd7ce5SGreg Kroah-Hartman if (!priv) 19096fd7ce5SGreg Kroah-Hartman return -ENOMEM; 19196fd7ce5SGreg Kroah-Hartman 192fa90e1c9SJiri Slaby file->private_data = priv; 193fa90e1c9SJiri Slaby 194fa90e1c9SJiri Slaby return 0; 195fa90e1c9SJiri Slaby } 196fa90e1c9SJiri Slaby 197fa90e1c9SJiri Slaby /* Associate a new file with the tty structure */ 198fa90e1c9SJiri Slaby void tty_add_file(struct tty_struct *tty, struct file *file) 199fa90e1c9SJiri Slaby { 200fa90e1c9SJiri Slaby struct tty_file_private *priv = file->private_data; 201fa90e1c9SJiri Slaby 20296fd7ce5SGreg Kroah-Hartman priv->tty = tty; 20396fd7ce5SGreg Kroah-Hartman priv->file = file; 20496fd7ce5SGreg Kroah-Hartman 2054a510969SPeter Hurley spin_lock(&tty->files_lock); 20696fd7ce5SGreg Kroah-Hartman list_add(&priv->list, &tty->tty_files); 2074a510969SPeter Hurley spin_unlock(&tty->files_lock); 208fa90e1c9SJiri Slaby } 20996fd7ce5SGreg Kroah-Hartman 210fa90e1c9SJiri Slaby /** 211fa90e1c9SJiri Slaby * tty_free_file - free file->private_data 212fa90e1c9SJiri Slaby * 213fa90e1c9SJiri Slaby * This shall be used only for fail path handling when tty_add_file was not 214fa90e1c9SJiri Slaby * called yet. 215fa90e1c9SJiri Slaby */ 216fa90e1c9SJiri Slaby void tty_free_file(struct file *file) 217fa90e1c9SJiri Slaby { 218fa90e1c9SJiri Slaby struct tty_file_private *priv = file->private_data; 219fa90e1c9SJiri Slaby 220fa90e1c9SJiri Slaby file->private_data = NULL; 221fa90e1c9SJiri Slaby kfree(priv); 22296fd7ce5SGreg Kroah-Hartman } 22396fd7ce5SGreg Kroah-Hartman 22496fd7ce5SGreg Kroah-Hartman /* Delete file from its tty */ 2252520e274SJosh Triplett static void tty_del_file(struct file *file) 22696fd7ce5SGreg Kroah-Hartman { 22796fd7ce5SGreg Kroah-Hartman struct tty_file_private *priv = file->private_data; 2284a510969SPeter Hurley struct tty_struct *tty = priv->tty; 22996fd7ce5SGreg Kroah-Hartman 2304a510969SPeter Hurley spin_lock(&tty->files_lock); 23196fd7ce5SGreg Kroah-Hartman list_del(&priv->list); 2324a510969SPeter Hurley spin_unlock(&tty->files_lock); 233fa90e1c9SJiri Slaby tty_free_file(file); 23496fd7ce5SGreg Kroah-Hartman } 23596fd7ce5SGreg Kroah-Hartman 23696fd7ce5SGreg Kroah-Hartman /** 23796fd7ce5SGreg Kroah-Hartman * tty_name - return tty naming 23896fd7ce5SGreg Kroah-Hartman * @tty: tty structure 23996fd7ce5SGreg Kroah-Hartman * 24096fd7ce5SGreg Kroah-Hartman * Convert a tty structure into a name. The name reflects the kernel 24196fd7ce5SGreg Kroah-Hartman * naming policy and if udev is in use may not reflect user space 24296fd7ce5SGreg Kroah-Hartman * 24396fd7ce5SGreg Kroah-Hartman * Locking: none 24496fd7ce5SGreg Kroah-Hartman */ 24596fd7ce5SGreg Kroah-Hartman 246429b4749SRasmus Villemoes const char *tty_name(const struct tty_struct *tty) 24796fd7ce5SGreg Kroah-Hartman { 24896fd7ce5SGreg Kroah-Hartman if (!tty) /* Hmm. NULL pointer. That's fun. */ 249917162c9SRasmus Villemoes return "NULL tty"; 250917162c9SRasmus Villemoes return tty->name; 25196fd7ce5SGreg Kroah-Hartman } 25296fd7ce5SGreg Kroah-Hartman 25396fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_name); 25496fd7ce5SGreg Kroah-Hartman 2550a083eddSPeter Hurley const char *tty_driver_name(const struct tty_struct *tty) 2560a083eddSPeter Hurley { 2570a083eddSPeter Hurley if (!tty || !tty->driver) 2580a083eddSPeter Hurley return ""; 2590a083eddSPeter Hurley return tty->driver->name; 2600a083eddSPeter Hurley } 2610a083eddSPeter Hurley 26282b8f888SPeter Hurley static int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 26396fd7ce5SGreg Kroah-Hartman const char *routine) 26496fd7ce5SGreg Kroah-Hartman { 26596fd7ce5SGreg Kroah-Hartman #ifdef TTY_PARANOIA_CHECK 26696fd7ce5SGreg Kroah-Hartman if (!tty) { 26789222e62SPeter Hurley pr_warn("(%d:%d): %s: NULL tty\n", 26896fd7ce5SGreg Kroah-Hartman imajor(inode), iminor(inode), routine); 26996fd7ce5SGreg Kroah-Hartman return 1; 27096fd7ce5SGreg Kroah-Hartman } 27196fd7ce5SGreg Kroah-Hartman if (tty->magic != TTY_MAGIC) { 27289222e62SPeter Hurley pr_warn("(%d:%d): %s: bad magic number\n", 27396fd7ce5SGreg Kroah-Hartman imajor(inode), iminor(inode), routine); 27496fd7ce5SGreg Kroah-Hartman return 1; 27596fd7ce5SGreg Kroah-Hartman } 27696fd7ce5SGreg Kroah-Hartman #endif 27796fd7ce5SGreg Kroah-Hartman return 0; 27896fd7ce5SGreg Kroah-Hartman } 27996fd7ce5SGreg Kroah-Hartman 280deb287e7SPeter Hurley /* Caller must hold tty_lock */ 28196fd7ce5SGreg Kroah-Hartman static int check_tty_count(struct tty_struct *tty, const char *routine) 28296fd7ce5SGreg Kroah-Hartman { 28396fd7ce5SGreg Kroah-Hartman #ifdef CHECK_TTY_COUNT 28496fd7ce5SGreg Kroah-Hartman struct list_head *p; 285a09ac397SOkash Khawaja int count = 0, kopen_count = 0; 28696fd7ce5SGreg Kroah-Hartman 2874a510969SPeter Hurley spin_lock(&tty->files_lock); 28896fd7ce5SGreg Kroah-Hartman list_for_each(p, &tty->tty_files) { 28996fd7ce5SGreg Kroah-Hartman count++; 29096fd7ce5SGreg Kroah-Hartman } 2914a510969SPeter Hurley spin_unlock(&tty->files_lock); 29296fd7ce5SGreg Kroah-Hartman if (tty->driver->type == TTY_DRIVER_TYPE_PTY && 29396fd7ce5SGreg Kroah-Hartman tty->driver->subtype == PTY_TYPE_SLAVE && 29496fd7ce5SGreg Kroah-Hartman tty->link && tty->link->count) 29596fd7ce5SGreg Kroah-Hartman count++; 296a09ac397SOkash Khawaja if (tty_port_kopened(tty->port)) 297a09ac397SOkash Khawaja kopen_count++; 298a09ac397SOkash Khawaja if (tty->count != (count + kopen_count)) { 299a09ac397SOkash Khawaja tty_warn(tty, "%s: tty->count(%d) != (#fd's(%d) + #kopen's(%d))\n", 300a09ac397SOkash Khawaja routine, tty->count, count, kopen_count); 301a09ac397SOkash Khawaja return (count + kopen_count); 30296fd7ce5SGreg Kroah-Hartman } 30396fd7ce5SGreg Kroah-Hartman #endif 30496fd7ce5SGreg Kroah-Hartman return 0; 30596fd7ce5SGreg Kroah-Hartman } 30696fd7ce5SGreg Kroah-Hartman 30796fd7ce5SGreg Kroah-Hartman /** 30896fd7ce5SGreg Kroah-Hartman * get_tty_driver - find device of a tty 30996fd7ce5SGreg Kroah-Hartman * @dev_t: device identifier 31096fd7ce5SGreg Kroah-Hartman * @index: returns the index of the tty 31196fd7ce5SGreg Kroah-Hartman * 31296fd7ce5SGreg Kroah-Hartman * This routine returns a tty driver structure, given a device number 31396fd7ce5SGreg Kroah-Hartman * and also passes back the index number. 31496fd7ce5SGreg Kroah-Hartman * 31596fd7ce5SGreg Kroah-Hartman * Locking: caller must hold tty_mutex 31696fd7ce5SGreg Kroah-Hartman */ 31796fd7ce5SGreg Kroah-Hartman 31896fd7ce5SGreg Kroah-Hartman static struct tty_driver *get_tty_driver(dev_t device, int *index) 31996fd7ce5SGreg Kroah-Hartman { 32096fd7ce5SGreg Kroah-Hartman struct tty_driver *p; 32196fd7ce5SGreg Kroah-Hartman 32296fd7ce5SGreg Kroah-Hartman list_for_each_entry(p, &tty_drivers, tty_drivers) { 32396fd7ce5SGreg Kroah-Hartman dev_t base = MKDEV(p->major, p->minor_start); 32496fd7ce5SGreg Kroah-Hartman if (device < base || device >= base + p->num) 32596fd7ce5SGreg Kroah-Hartman continue; 32696fd7ce5SGreg Kroah-Hartman *index = device - base; 32796fd7ce5SGreg Kroah-Hartman return tty_driver_kref_get(p); 32896fd7ce5SGreg Kroah-Hartman } 32996fd7ce5SGreg Kroah-Hartman return NULL; 33096fd7ce5SGreg Kroah-Hartman } 33196fd7ce5SGreg Kroah-Hartman 332fc61ed51SOkash Khawaja /** 333fc61ed51SOkash Khawaja * tty_dev_name_to_number - return dev_t for device name 334fc61ed51SOkash Khawaja * @name: user space name of device under /dev 335fc61ed51SOkash Khawaja * @number: pointer to dev_t that this function will populate 336fc61ed51SOkash Khawaja * 337fc61ed51SOkash Khawaja * This function converts device names like ttyS0 or ttyUSB1 into dev_t 338fc61ed51SOkash Khawaja * like (4, 64) or (188, 1). If no corresponding driver is registered then 339fc61ed51SOkash Khawaja * the function returns -ENODEV. 340fc61ed51SOkash Khawaja * 341fc61ed51SOkash Khawaja * Locking: this acquires tty_mutex to protect the tty_drivers list from 342fc61ed51SOkash Khawaja * being modified while we are traversing it, and makes sure to 343fc61ed51SOkash Khawaja * release it before exiting. 344fc61ed51SOkash Khawaja */ 345fc61ed51SOkash Khawaja int tty_dev_name_to_number(const char *name, dev_t *number) 346fc61ed51SOkash Khawaja { 347fc61ed51SOkash Khawaja struct tty_driver *p; 348fc61ed51SOkash Khawaja int ret; 349fc61ed51SOkash Khawaja int index, prefix_length = 0; 350fc61ed51SOkash Khawaja const char *str; 351fc61ed51SOkash Khawaja 352fc61ed51SOkash Khawaja for (str = name; *str && !isdigit(*str); str++) 353fc61ed51SOkash Khawaja ; 354fc61ed51SOkash Khawaja 355fc61ed51SOkash Khawaja if (!*str) 356fc61ed51SOkash Khawaja return -EINVAL; 357fc61ed51SOkash Khawaja 358fc61ed51SOkash Khawaja ret = kstrtoint(str, 10, &index); 359fc61ed51SOkash Khawaja if (ret) 360fc61ed51SOkash Khawaja return ret; 361fc61ed51SOkash Khawaja 362fc61ed51SOkash Khawaja prefix_length = str - name; 363fc61ed51SOkash Khawaja mutex_lock(&tty_mutex); 364fc61ed51SOkash Khawaja 365fc61ed51SOkash Khawaja list_for_each_entry(p, &tty_drivers, tty_drivers) 366fc61ed51SOkash Khawaja if (prefix_length == strlen(p->name) && strncmp(name, 367fc61ed51SOkash Khawaja p->name, prefix_length) == 0) { 368fc61ed51SOkash Khawaja if (index < p->num) { 369fc61ed51SOkash Khawaja *number = MKDEV(p->major, p->minor_start + index); 370fc61ed51SOkash Khawaja goto out; 371fc61ed51SOkash Khawaja } 372fc61ed51SOkash Khawaja } 373fc61ed51SOkash Khawaja 374fc61ed51SOkash Khawaja /* if here then driver wasn't found */ 375fc61ed51SOkash Khawaja ret = -ENODEV; 376fc61ed51SOkash Khawaja out: 377fc61ed51SOkash Khawaja mutex_unlock(&tty_mutex); 378fc61ed51SOkash Khawaja return ret; 379fc61ed51SOkash Khawaja } 380fc61ed51SOkash Khawaja EXPORT_SYMBOL_GPL(tty_dev_name_to_number); 381fc61ed51SOkash Khawaja 38296fd7ce5SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 38396fd7ce5SGreg Kroah-Hartman 38496fd7ce5SGreg Kroah-Hartman /** 38596fd7ce5SGreg Kroah-Hartman * tty_find_polling_driver - find device of a polled tty 38696fd7ce5SGreg Kroah-Hartman * @name: name string to match 38796fd7ce5SGreg Kroah-Hartman * @line: pointer to resulting tty line nr 38896fd7ce5SGreg Kroah-Hartman * 38996fd7ce5SGreg Kroah-Hartman * This routine returns a tty driver structure, given a name 39096fd7ce5SGreg Kroah-Hartman * and the condition that the tty driver is capable of polled 39196fd7ce5SGreg Kroah-Hartman * operation. 39296fd7ce5SGreg Kroah-Hartman */ 39396fd7ce5SGreg Kroah-Hartman struct tty_driver *tty_find_polling_driver(char *name, int *line) 39496fd7ce5SGreg Kroah-Hartman { 39596fd7ce5SGreg Kroah-Hartman struct tty_driver *p, *res = NULL; 39696fd7ce5SGreg Kroah-Hartman int tty_line = 0; 39796fd7ce5SGreg Kroah-Hartman int len; 39896fd7ce5SGreg Kroah-Hartman char *str, *stp; 39996fd7ce5SGreg Kroah-Hartman 40096fd7ce5SGreg Kroah-Hartman for (str = name; *str; str++) 40196fd7ce5SGreg Kroah-Hartman if ((*str >= '0' && *str <= '9') || *str == ',') 40296fd7ce5SGreg Kroah-Hartman break; 40396fd7ce5SGreg Kroah-Hartman if (!*str) 40496fd7ce5SGreg Kroah-Hartman return NULL; 40596fd7ce5SGreg Kroah-Hartman 40696fd7ce5SGreg Kroah-Hartman len = str - name; 40796fd7ce5SGreg Kroah-Hartman tty_line = simple_strtoul(str, &str, 10); 40896fd7ce5SGreg Kroah-Hartman 40996fd7ce5SGreg Kroah-Hartman mutex_lock(&tty_mutex); 41096fd7ce5SGreg Kroah-Hartman /* Search through the tty devices to look for a match */ 41196fd7ce5SGreg Kroah-Hartman list_for_each_entry(p, &tty_drivers, tty_drivers) { 41233a1a7beSMiles Chen if (!len || strncmp(name, p->name, len) != 0) 41396fd7ce5SGreg Kroah-Hartman continue; 41496fd7ce5SGreg Kroah-Hartman stp = str; 41596fd7ce5SGreg Kroah-Hartman if (*stp == ',') 41696fd7ce5SGreg Kroah-Hartman stp++; 41796fd7ce5SGreg Kroah-Hartman if (*stp == '\0') 41896fd7ce5SGreg Kroah-Hartman stp = NULL; 41996fd7ce5SGreg Kroah-Hartman 42096fd7ce5SGreg Kroah-Hartman if (tty_line >= 0 && tty_line < p->num && p->ops && 42196fd7ce5SGreg Kroah-Hartman p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) { 42296fd7ce5SGreg Kroah-Hartman res = tty_driver_kref_get(p); 42396fd7ce5SGreg Kroah-Hartman *line = tty_line; 42496fd7ce5SGreg Kroah-Hartman break; 42596fd7ce5SGreg Kroah-Hartman } 42696fd7ce5SGreg Kroah-Hartman } 42796fd7ce5SGreg Kroah-Hartman mutex_unlock(&tty_mutex); 42896fd7ce5SGreg Kroah-Hartman 42996fd7ce5SGreg Kroah-Hartman return res; 43096fd7ce5SGreg Kroah-Hartman } 43196fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(tty_find_polling_driver); 43296fd7ce5SGreg Kroah-Hartman #endif 43396fd7ce5SGreg Kroah-Hartman 43496fd7ce5SGreg Kroah-Hartman static ssize_t hung_up_tty_read(struct file *file, char __user *buf, 43596fd7ce5SGreg Kroah-Hartman size_t count, loff_t *ppos) 43696fd7ce5SGreg Kroah-Hartman { 43796fd7ce5SGreg Kroah-Hartman return 0; 43896fd7ce5SGreg Kroah-Hartman } 43996fd7ce5SGreg Kroah-Hartman 44096fd7ce5SGreg Kroah-Hartman static ssize_t hung_up_tty_write(struct file *file, const char __user *buf, 44196fd7ce5SGreg Kroah-Hartman size_t count, loff_t *ppos) 44296fd7ce5SGreg Kroah-Hartman { 44396fd7ce5SGreg Kroah-Hartman return -EIO; 44496fd7ce5SGreg Kroah-Hartman } 44596fd7ce5SGreg Kroah-Hartman 44696fd7ce5SGreg Kroah-Hartman /* No kernel lock held - none needed ;) */ 447afc9a42bSAl Viro static __poll_t hung_up_tty_poll(struct file *filp, poll_table *wait) 44896fd7ce5SGreg Kroah-Hartman { 449a9a08845SLinus Torvalds return EPOLLIN | EPOLLOUT | EPOLLERR | EPOLLHUP | EPOLLRDNORM | EPOLLWRNORM; 45096fd7ce5SGreg Kroah-Hartman } 45196fd7ce5SGreg Kroah-Hartman 45296fd7ce5SGreg Kroah-Hartman static long hung_up_tty_ioctl(struct file *file, unsigned int cmd, 45396fd7ce5SGreg Kroah-Hartman unsigned long arg) 45496fd7ce5SGreg Kroah-Hartman { 45596fd7ce5SGreg Kroah-Hartman return cmd == TIOCSPGRP ? -ENOTTY : -EIO; 45696fd7ce5SGreg Kroah-Hartman } 45796fd7ce5SGreg Kroah-Hartman 45896fd7ce5SGreg Kroah-Hartman static long hung_up_tty_compat_ioctl(struct file *file, 45996fd7ce5SGreg Kroah-Hartman unsigned int cmd, unsigned long arg) 46096fd7ce5SGreg Kroah-Hartman { 46196fd7ce5SGreg Kroah-Hartman return cmd == TIOCSPGRP ? -ENOTTY : -EIO; 46296fd7ce5SGreg Kroah-Hartman } 46396fd7ce5SGreg Kroah-Hartman 464f557474cSPeter Hurley static int hung_up_tty_fasync(int fd, struct file *file, int on) 465f557474cSPeter Hurley { 466f557474cSPeter Hurley return -ENOTTY; 467f557474cSPeter Hurley } 468f557474cSPeter Hurley 469d01c3289SMasatake YAMATO static void tty_show_fdinfo(struct seq_file *m, struct file *file) 470d01c3289SMasatake YAMATO { 471d01c3289SMasatake YAMATO struct tty_struct *tty = file_tty(file); 472d01c3289SMasatake YAMATO 473d01c3289SMasatake YAMATO if (tty && tty->ops && tty->ops->show_fdinfo) 474d01c3289SMasatake YAMATO tty->ops->show_fdinfo(tty, m); 475d01c3289SMasatake YAMATO } 476d01c3289SMasatake YAMATO 47796fd7ce5SGreg Kroah-Hartman static const struct file_operations tty_fops = { 47896fd7ce5SGreg Kroah-Hartman .llseek = no_llseek, 47996fd7ce5SGreg Kroah-Hartman .read = tty_read, 48096fd7ce5SGreg Kroah-Hartman .write = tty_write, 48196fd7ce5SGreg Kroah-Hartman .poll = tty_poll, 48296fd7ce5SGreg Kroah-Hartman .unlocked_ioctl = tty_ioctl, 48396fd7ce5SGreg Kroah-Hartman .compat_ioctl = tty_compat_ioctl, 48496fd7ce5SGreg Kroah-Hartman .open = tty_open, 48596fd7ce5SGreg Kroah-Hartman .release = tty_release, 48696fd7ce5SGreg Kroah-Hartman .fasync = tty_fasync, 487d01c3289SMasatake YAMATO .show_fdinfo = tty_show_fdinfo, 48896fd7ce5SGreg Kroah-Hartman }; 48996fd7ce5SGreg Kroah-Hartman 49096fd7ce5SGreg Kroah-Hartman static const struct file_operations console_fops = { 49196fd7ce5SGreg Kroah-Hartman .llseek = no_llseek, 49296fd7ce5SGreg Kroah-Hartman .read = tty_read, 49396fd7ce5SGreg Kroah-Hartman .write = redirected_tty_write, 49496fd7ce5SGreg Kroah-Hartman .poll = tty_poll, 49596fd7ce5SGreg Kroah-Hartman .unlocked_ioctl = tty_ioctl, 49696fd7ce5SGreg Kroah-Hartman .compat_ioctl = tty_compat_ioctl, 49796fd7ce5SGreg Kroah-Hartman .open = tty_open, 49896fd7ce5SGreg Kroah-Hartman .release = tty_release, 49996fd7ce5SGreg Kroah-Hartman .fasync = tty_fasync, 50096fd7ce5SGreg Kroah-Hartman }; 50196fd7ce5SGreg Kroah-Hartman 50296fd7ce5SGreg Kroah-Hartman static const struct file_operations hung_up_tty_fops = { 50396fd7ce5SGreg Kroah-Hartman .llseek = no_llseek, 50496fd7ce5SGreg Kroah-Hartman .read = hung_up_tty_read, 50596fd7ce5SGreg Kroah-Hartman .write = hung_up_tty_write, 50696fd7ce5SGreg Kroah-Hartman .poll = hung_up_tty_poll, 50796fd7ce5SGreg Kroah-Hartman .unlocked_ioctl = hung_up_tty_ioctl, 50896fd7ce5SGreg Kroah-Hartman .compat_ioctl = hung_up_tty_compat_ioctl, 50996fd7ce5SGreg Kroah-Hartman .release = tty_release, 510f557474cSPeter Hurley .fasync = hung_up_tty_fasync, 51196fd7ce5SGreg Kroah-Hartman }; 51296fd7ce5SGreg Kroah-Hartman 51396fd7ce5SGreg Kroah-Hartman static DEFINE_SPINLOCK(redirect_lock); 51496fd7ce5SGreg Kroah-Hartman static struct file *redirect; 51596fd7ce5SGreg Kroah-Hartman 5167c0cca7cSGreg Kroah-Hartman extern void tty_sysctl_init(void); 5177c0cca7cSGreg Kroah-Hartman 51896fd7ce5SGreg Kroah-Hartman /** 51996fd7ce5SGreg Kroah-Hartman * tty_wakeup - request more data 52096fd7ce5SGreg Kroah-Hartman * @tty: terminal 52196fd7ce5SGreg Kroah-Hartman * 52296fd7ce5SGreg Kroah-Hartman * Internal and external helper for wakeups of tty. This function 52396fd7ce5SGreg Kroah-Hartman * informs the line discipline if present that the driver is ready 52496fd7ce5SGreg Kroah-Hartman * to receive more output data. 52596fd7ce5SGreg Kroah-Hartman */ 52696fd7ce5SGreg Kroah-Hartman 52796fd7ce5SGreg Kroah-Hartman void tty_wakeup(struct tty_struct *tty) 52896fd7ce5SGreg Kroah-Hartman { 52996fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 53096fd7ce5SGreg Kroah-Hartman 53196fd7ce5SGreg Kroah-Hartman if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) { 53296fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref(tty); 53396fd7ce5SGreg Kroah-Hartman if (ld) { 53496fd7ce5SGreg Kroah-Hartman if (ld->ops->write_wakeup) 53596fd7ce5SGreg Kroah-Hartman ld->ops->write_wakeup(tty); 53696fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 53796fd7ce5SGreg Kroah-Hartman } 53896fd7ce5SGreg Kroah-Hartman } 539a9a08845SLinus Torvalds wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); 54096fd7ce5SGreg Kroah-Hartman } 54196fd7ce5SGreg Kroah-Hartman 54296fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(tty_wakeup); 54396fd7ce5SGreg Kroah-Hartman 54496fd7ce5SGreg Kroah-Hartman /** 54596fd7ce5SGreg Kroah-Hartman * __tty_hangup - actual handler for hangup events 54696fd7ce5SGreg Kroah-Hartman * @work: tty device 54796fd7ce5SGreg Kroah-Hartman * 548ef4f527cSKevin Cernekee * This can be called by a "kworker" kernel thread. That is process 54996fd7ce5SGreg Kroah-Hartman * synchronous but doesn't hold any locks, so we need to make sure we 55096fd7ce5SGreg Kroah-Hartman * have the appropriate locks for what we're doing. 55196fd7ce5SGreg Kroah-Hartman * 55296fd7ce5SGreg Kroah-Hartman * The hangup event clears any pending redirections onto the hung up 55396fd7ce5SGreg Kroah-Hartman * device. It ensures future writes will error and it does the needed 55496fd7ce5SGreg Kroah-Hartman * line discipline hangup and signal delivery. The tty object itself 55596fd7ce5SGreg Kroah-Hartman * remains intact. 55696fd7ce5SGreg Kroah-Hartman * 55796fd7ce5SGreg Kroah-Hartman * Locking: 55896fd7ce5SGreg Kroah-Hartman * BTM 55996fd7ce5SGreg Kroah-Hartman * redirect lock for undoing redirection 56096fd7ce5SGreg Kroah-Hartman * file list lock for manipulating list of ttys 561137084bbSPeter Hurley * tty_ldiscs_lock from called functions 5626a1c0680SPeter Hurley * termios_rwsem resetting termios data 56396fd7ce5SGreg Kroah-Hartman * tasklist_lock to walk task list for hangup event 56496fd7ce5SGreg Kroah-Hartman * ->siglock to protect ->signal/->sighand 56596fd7ce5SGreg Kroah-Hartman */ 566f91e2590SPeter Hurley static void __tty_hangup(struct tty_struct *tty, int exit_session) 56796fd7ce5SGreg Kroah-Hartman { 56896fd7ce5SGreg Kroah-Hartman struct file *cons_filp = NULL; 56996fd7ce5SGreg Kroah-Hartman struct file *filp, *f = NULL; 57096fd7ce5SGreg Kroah-Hartman struct tty_file_private *priv; 57196fd7ce5SGreg Kroah-Hartman int closecount = 0, n; 572ea648a47SPeter Hurley int refs; 57396fd7ce5SGreg Kroah-Hartman 57496fd7ce5SGreg Kroah-Hartman if (!tty) 57596fd7ce5SGreg Kroah-Hartman return; 57696fd7ce5SGreg Kroah-Hartman 57796fd7ce5SGreg Kroah-Hartman 57896fd7ce5SGreg Kroah-Hartman spin_lock(&redirect_lock); 57996fd7ce5SGreg Kroah-Hartman if (redirect && file_tty(redirect) == tty) { 58096fd7ce5SGreg Kroah-Hartman f = redirect; 58196fd7ce5SGreg Kroah-Hartman redirect = NULL; 58296fd7ce5SGreg Kroah-Hartman } 58396fd7ce5SGreg Kroah-Hartman spin_unlock(&redirect_lock); 58496fd7ce5SGreg Kroah-Hartman 58589c8d91eSAlan Cox tty_lock(tty); 58696fd7ce5SGreg Kroah-Hartman 587cb50e523SPeter Hurley if (test_bit(TTY_HUPPED, &tty->flags)) { 588cb50e523SPeter Hurley tty_unlock(tty); 589cb50e523SPeter Hurley return; 590cb50e523SPeter Hurley } 591cb50e523SPeter Hurley 59228b0f8a6STejun Heo /* 59328b0f8a6STejun Heo * Some console devices aren't actually hung up for technical and 59428b0f8a6STejun Heo * historical reasons, which can lead to indefinite interruptible 59528b0f8a6STejun Heo * sleep in n_tty_read(). The following explicitly tells 59628b0f8a6STejun Heo * n_tty_read() to abort readers. 59728b0f8a6STejun Heo */ 59828b0f8a6STejun Heo set_bit(TTY_HUPPING, &tty->flags); 59928b0f8a6STejun Heo 60096fd7ce5SGreg Kroah-Hartman /* inuse_filps is protected by the single tty lock, 60196fd7ce5SGreg Kroah-Hartman this really needs to change if we want to flush the 60296fd7ce5SGreg Kroah-Hartman workqueue with the lock held */ 60396fd7ce5SGreg Kroah-Hartman check_tty_count(tty, "tty_hangup"); 60496fd7ce5SGreg Kroah-Hartman 6054a510969SPeter Hurley spin_lock(&tty->files_lock); 60696fd7ce5SGreg Kroah-Hartman /* This breaks for file handles being sent over AF_UNIX sockets ? */ 60796fd7ce5SGreg Kroah-Hartman list_for_each_entry(priv, &tty->tty_files, list) { 60896fd7ce5SGreg Kroah-Hartman filp = priv->file; 60996fd7ce5SGreg Kroah-Hartman if (filp->f_op->write == redirected_tty_write) 61096fd7ce5SGreg Kroah-Hartman cons_filp = filp; 61196fd7ce5SGreg Kroah-Hartman if (filp->f_op->write != tty_write) 61296fd7ce5SGreg Kroah-Hartman continue; 61396fd7ce5SGreg Kroah-Hartman closecount++; 61496fd7ce5SGreg Kroah-Hartman __tty_fasync(-1, filp, 0); /* can't block */ 61596fd7ce5SGreg Kroah-Hartman filp->f_op = &hung_up_tty_fops; 61696fd7ce5SGreg Kroah-Hartman } 6174a510969SPeter Hurley spin_unlock(&tty->files_lock); 61896fd7ce5SGreg Kroah-Hartman 61925fdf243SPeter Hurley refs = tty_signal_session_leader(tty, exit_session); 62025fdf243SPeter Hurley /* Account for the p->signal references we killed */ 62125fdf243SPeter Hurley while (refs--) 62225fdf243SPeter Hurley tty_kref_put(tty); 62325fdf243SPeter Hurley 624892d1fa7SPeter Hurley tty_ldisc_hangup(tty, cons_filp != NULL); 62596fd7ce5SGreg Kroah-Hartman 62620cc225bSPeter Hurley spin_lock_irq(&tty->ctrl_lock); 62796fd7ce5SGreg Kroah-Hartman clear_bit(TTY_THROTTLED, &tty->flags); 62896fd7ce5SGreg Kroah-Hartman clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 62996fd7ce5SGreg Kroah-Hartman put_pid(tty->session); 63096fd7ce5SGreg Kroah-Hartman put_pid(tty->pgrp); 63196fd7ce5SGreg Kroah-Hartman tty->session = NULL; 63296fd7ce5SGreg Kroah-Hartman tty->pgrp = NULL; 63396fd7ce5SGreg Kroah-Hartman tty->ctrl_status = 0; 63420cc225bSPeter Hurley spin_unlock_irq(&tty->ctrl_lock); 63596fd7ce5SGreg Kroah-Hartman 63696fd7ce5SGreg Kroah-Hartman /* 63796fd7ce5SGreg Kroah-Hartman * If one of the devices matches a console pointer, we 63896fd7ce5SGreg Kroah-Hartman * cannot just call hangup() because that will cause 63996fd7ce5SGreg Kroah-Hartman * tty->count and state->count to go out of sync. 64096fd7ce5SGreg Kroah-Hartman * So we just call close() the right number of times. 64196fd7ce5SGreg Kroah-Hartman */ 64296fd7ce5SGreg Kroah-Hartman if (cons_filp) { 64396fd7ce5SGreg Kroah-Hartman if (tty->ops->close) 64496fd7ce5SGreg Kroah-Hartman for (n = 0; n < closecount; n++) 64596fd7ce5SGreg Kroah-Hartman tty->ops->close(tty, cons_filp); 64696fd7ce5SGreg Kroah-Hartman } else if (tty->ops->hangup) 6477c6d340fSPeter Hurley tty->ops->hangup(tty); 64896fd7ce5SGreg Kroah-Hartman /* 649892d1fa7SPeter Hurley * We don't want to have driver/ldisc interactions beyond the ones 650892d1fa7SPeter Hurley * we did here. The driver layer expects no calls after ->hangup() 651892d1fa7SPeter Hurley * from the ldisc side, which is now guaranteed. 65296fd7ce5SGreg Kroah-Hartman */ 65396fd7ce5SGreg Kroah-Hartman set_bit(TTY_HUPPED, &tty->flags); 65428b0f8a6STejun Heo clear_bit(TTY_HUPPING, &tty->flags); 65589c8d91eSAlan Cox tty_unlock(tty); 65696fd7ce5SGreg Kroah-Hartman 65796fd7ce5SGreg Kroah-Hartman if (f) 65896fd7ce5SGreg Kroah-Hartman fput(f); 65996fd7ce5SGreg Kroah-Hartman } 66096fd7ce5SGreg Kroah-Hartman 66196fd7ce5SGreg Kroah-Hartman static void do_tty_hangup(struct work_struct *work) 66296fd7ce5SGreg Kroah-Hartman { 66396fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = 66496fd7ce5SGreg Kroah-Hartman container_of(work, struct tty_struct, hangup_work); 66596fd7ce5SGreg Kroah-Hartman 666f91e2590SPeter Hurley __tty_hangup(tty, 0); 66796fd7ce5SGreg Kroah-Hartman } 66896fd7ce5SGreg Kroah-Hartman 66996fd7ce5SGreg Kroah-Hartman /** 67096fd7ce5SGreg Kroah-Hartman * tty_hangup - trigger a hangup event 67196fd7ce5SGreg Kroah-Hartman * @tty: tty to hangup 67296fd7ce5SGreg Kroah-Hartman * 67396fd7ce5SGreg Kroah-Hartman * A carrier loss (virtual or otherwise) has occurred on this like 67496fd7ce5SGreg Kroah-Hartman * schedule a hangup sequence to run after this event. 67596fd7ce5SGreg Kroah-Hartman */ 67696fd7ce5SGreg Kroah-Hartman 67796fd7ce5SGreg Kroah-Hartman void tty_hangup(struct tty_struct *tty) 67896fd7ce5SGreg Kroah-Hartman { 679d435cefeSPeter Hurley tty_debug_hangup(tty, "hangup\n"); 68096fd7ce5SGreg Kroah-Hartman schedule_work(&tty->hangup_work); 68196fd7ce5SGreg Kroah-Hartman } 68296fd7ce5SGreg Kroah-Hartman 68396fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_hangup); 68496fd7ce5SGreg Kroah-Hartman 68596fd7ce5SGreg Kroah-Hartman /** 68696fd7ce5SGreg Kroah-Hartman * tty_vhangup - process vhangup 68796fd7ce5SGreg Kroah-Hartman * @tty: tty to hangup 68896fd7ce5SGreg Kroah-Hartman * 68996fd7ce5SGreg Kroah-Hartman * The user has asked via system call for the terminal to be hung up. 69096fd7ce5SGreg Kroah-Hartman * We do this synchronously so that when the syscall returns the process 69196fd7ce5SGreg Kroah-Hartman * is complete. That guarantee is necessary for security reasons. 69296fd7ce5SGreg Kroah-Hartman */ 69396fd7ce5SGreg Kroah-Hartman 69496fd7ce5SGreg Kroah-Hartman void tty_vhangup(struct tty_struct *tty) 69596fd7ce5SGreg Kroah-Hartman { 696d435cefeSPeter Hurley tty_debug_hangup(tty, "vhangup\n"); 697f91e2590SPeter Hurley __tty_hangup(tty, 0); 69896fd7ce5SGreg Kroah-Hartman } 69996fd7ce5SGreg Kroah-Hartman 70096fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_vhangup); 70196fd7ce5SGreg Kroah-Hartman 70296fd7ce5SGreg Kroah-Hartman 70396fd7ce5SGreg Kroah-Hartman /** 70496fd7ce5SGreg Kroah-Hartman * tty_vhangup_self - process vhangup for own ctty 70596fd7ce5SGreg Kroah-Hartman * 70696fd7ce5SGreg Kroah-Hartman * Perform a vhangup on the current controlling tty 70796fd7ce5SGreg Kroah-Hartman */ 70896fd7ce5SGreg Kroah-Hartman 70996fd7ce5SGreg Kroah-Hartman void tty_vhangup_self(void) 71096fd7ce5SGreg Kroah-Hartman { 71196fd7ce5SGreg Kroah-Hartman struct tty_struct *tty; 71296fd7ce5SGreg Kroah-Hartman 71396fd7ce5SGreg Kroah-Hartman tty = get_current_tty(); 71496fd7ce5SGreg Kroah-Hartman if (tty) { 71596fd7ce5SGreg Kroah-Hartman tty_vhangup(tty); 71696fd7ce5SGreg Kroah-Hartman tty_kref_put(tty); 71796fd7ce5SGreg Kroah-Hartman } 71896fd7ce5SGreg Kroah-Hartman } 71996fd7ce5SGreg Kroah-Hartman 72096fd7ce5SGreg Kroah-Hartman /** 721f91e2590SPeter Hurley * tty_vhangup_session - hangup session leader exit 722f91e2590SPeter Hurley * @tty: tty to hangup 723f91e2590SPeter Hurley * 724f91e2590SPeter Hurley * The session leader is exiting and hanging up its controlling terminal. 725f91e2590SPeter Hurley * Every process in the foreground process group is signalled SIGHUP. 726f91e2590SPeter Hurley * 727f91e2590SPeter Hurley * We do this synchronously so that when the syscall returns the process 728f91e2590SPeter Hurley * is complete. That guarantee is necessary for security reasons. 729f91e2590SPeter Hurley */ 730f91e2590SPeter Hurley 731a1235b3eSNicolas Pitre void tty_vhangup_session(struct tty_struct *tty) 732f91e2590SPeter Hurley { 733d435cefeSPeter Hurley tty_debug_hangup(tty, "session hangup\n"); 734f91e2590SPeter Hurley __tty_hangup(tty, 1); 735f91e2590SPeter Hurley } 736f91e2590SPeter Hurley 737f91e2590SPeter Hurley /** 73896fd7ce5SGreg Kroah-Hartman * tty_hung_up_p - was tty hung up 73996fd7ce5SGreg Kroah-Hartman * @filp: file pointer of tty 74096fd7ce5SGreg Kroah-Hartman * 74196fd7ce5SGreg Kroah-Hartman * Return true if the tty has been subject to a vhangup or a carrier 74296fd7ce5SGreg Kroah-Hartman * loss 74396fd7ce5SGreg Kroah-Hartman */ 74496fd7ce5SGreg Kroah-Hartman 74596fd7ce5SGreg Kroah-Hartman int tty_hung_up_p(struct file *filp) 74696fd7ce5SGreg Kroah-Hartman { 747ed3f0af8SAlan Cox return (filp && filp->f_op == &hung_up_tty_fops); 74896fd7ce5SGreg Kroah-Hartman } 74996fd7ce5SGreg Kroah-Hartman 75096fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_hung_up_p); 75196fd7ce5SGreg Kroah-Hartman 75296fd7ce5SGreg Kroah-Hartman /** 75396fd7ce5SGreg Kroah-Hartman * stop_tty - propagate flow control 75496fd7ce5SGreg Kroah-Hartman * @tty: tty to stop 75596fd7ce5SGreg Kroah-Hartman * 75601adc807SPeter Hurley * Perform flow control to the driver. May be called 75796fd7ce5SGreg Kroah-Hartman * on an already stopped device and will not re-call the driver 75896fd7ce5SGreg Kroah-Hartman * method. 75996fd7ce5SGreg Kroah-Hartman * 76096fd7ce5SGreg Kroah-Hartman * This functionality is used by both the line disciplines for 76196fd7ce5SGreg Kroah-Hartman * halting incoming flow and by the driver. It may therefore be 76296fd7ce5SGreg Kroah-Hartman * called from any context, may be under the tty atomic_write_lock 76396fd7ce5SGreg Kroah-Hartman * but not always. 76496fd7ce5SGreg Kroah-Hartman * 76596fd7ce5SGreg Kroah-Hartman * Locking: 766f9e053dcSPeter Hurley * flow_lock 76796fd7ce5SGreg Kroah-Hartman */ 76896fd7ce5SGreg Kroah-Hartman 769f9e053dcSPeter Hurley void __stop_tty(struct tty_struct *tty) 77096fd7ce5SGreg Kroah-Hartman { 771f9e053dcSPeter Hurley if (tty->stopped) 77296fd7ce5SGreg Kroah-Hartman return; 77396fd7ce5SGreg Kroah-Hartman tty->stopped = 1; 77496fd7ce5SGreg Kroah-Hartman if (tty->ops->stop) 775c961bfb1SPeter Hurley tty->ops->stop(tty); 77696fd7ce5SGreg Kroah-Hartman } 77796fd7ce5SGreg Kroah-Hartman 778f9e053dcSPeter Hurley void stop_tty(struct tty_struct *tty) 779f9e053dcSPeter Hurley { 780f9e053dcSPeter Hurley unsigned long flags; 781f9e053dcSPeter Hurley 782f9e053dcSPeter Hurley spin_lock_irqsave(&tty->flow_lock, flags); 783f9e053dcSPeter Hurley __stop_tty(tty); 784f9e053dcSPeter Hurley spin_unlock_irqrestore(&tty->flow_lock, flags); 785f9e053dcSPeter Hurley } 78696fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(stop_tty); 78796fd7ce5SGreg Kroah-Hartman 78896fd7ce5SGreg Kroah-Hartman /** 78996fd7ce5SGreg Kroah-Hartman * start_tty - propagate flow control 79096fd7ce5SGreg Kroah-Hartman * @tty: tty to start 79196fd7ce5SGreg Kroah-Hartman * 79201adc807SPeter Hurley * Start a tty that has been stopped if at all possible. If this 79301adc807SPeter Hurley * tty was previous stopped and is now being started, the driver 79401adc807SPeter Hurley * start method is invoked and the line discipline woken. 79596fd7ce5SGreg Kroah-Hartman * 79696fd7ce5SGreg Kroah-Hartman * Locking: 797f9e053dcSPeter Hurley * flow_lock 79896fd7ce5SGreg Kroah-Hartman */ 79996fd7ce5SGreg Kroah-Hartman 800f9e053dcSPeter Hurley void __start_tty(struct tty_struct *tty) 80196fd7ce5SGreg Kroah-Hartman { 802f9e053dcSPeter Hurley if (!tty->stopped || tty->flow_stopped) 80396fd7ce5SGreg Kroah-Hartman return; 80496fd7ce5SGreg Kroah-Hartman tty->stopped = 0; 80596fd7ce5SGreg Kroah-Hartman if (tty->ops->start) 806c961bfb1SPeter Hurley tty->ops->start(tty); 80796fd7ce5SGreg Kroah-Hartman tty_wakeup(tty); 80896fd7ce5SGreg Kroah-Hartman } 80996fd7ce5SGreg Kroah-Hartman 810f9e053dcSPeter Hurley void start_tty(struct tty_struct *tty) 811f9e053dcSPeter Hurley { 812f9e053dcSPeter Hurley unsigned long flags; 813f9e053dcSPeter Hurley 814f9e053dcSPeter Hurley spin_lock_irqsave(&tty->flow_lock, flags); 815f9e053dcSPeter Hurley __start_tty(tty); 816f9e053dcSPeter Hurley spin_unlock_irqrestore(&tty->flow_lock, flags); 817f9e053dcSPeter Hurley } 81896fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(start_tty); 81996fd7ce5SGreg Kroah-Hartman 820c884f871SArnd Bergmann static void tty_update_time(struct timespec64 *time) 82137b7f3c7SJiri Slaby { 822c884f871SArnd Bergmann time64_t sec = ktime_get_real_seconds(); 823fbf47635SGreg Kroah-Hartman 824fbf47635SGreg Kroah-Hartman /* 825fbf47635SGreg Kroah-Hartman * We only care if the two values differ in anything other than the 826fbf47635SGreg Kroah-Hartman * lower three bits (i.e every 8 seconds). If so, then we can update 827fbf47635SGreg Kroah-Hartman * the time of the tty device, otherwise it could be construded as a 828fbf47635SGreg Kroah-Hartman * security leak to let userspace know the exact timing of the tty. 829fbf47635SGreg Kroah-Hartman */ 830fbf47635SGreg Kroah-Hartman if ((sec ^ time->tv_sec) & ~7) 83137b7f3c7SJiri Slaby time->tv_sec = sec; 83237b7f3c7SJiri Slaby } 83337b7f3c7SJiri Slaby 83496fd7ce5SGreg Kroah-Hartman /** 83596fd7ce5SGreg Kroah-Hartman * tty_read - read method for tty device files 83696fd7ce5SGreg Kroah-Hartman * @file: pointer to tty file 83796fd7ce5SGreg Kroah-Hartman * @buf: user buffer 83896fd7ce5SGreg Kroah-Hartman * @count: size of user buffer 83996fd7ce5SGreg Kroah-Hartman * @ppos: unused 84096fd7ce5SGreg Kroah-Hartman * 84196fd7ce5SGreg Kroah-Hartman * Perform the read system call function on this terminal device. Checks 84296fd7ce5SGreg Kroah-Hartman * for hung up devices before calling the line discipline method. 84396fd7ce5SGreg Kroah-Hartman * 84496fd7ce5SGreg Kroah-Hartman * Locking: 84596fd7ce5SGreg Kroah-Hartman * Locks the line discipline internally while needed. Multiple 84696fd7ce5SGreg Kroah-Hartman * read calls may be outstanding in parallel. 84796fd7ce5SGreg Kroah-Hartman */ 84896fd7ce5SGreg Kroah-Hartman 84996fd7ce5SGreg Kroah-Hartman static ssize_t tty_read(struct file *file, char __user *buf, size_t count, 85096fd7ce5SGreg Kroah-Hartman loff_t *ppos) 85196fd7ce5SGreg Kroah-Hartman { 85296fd7ce5SGreg Kroah-Hartman int i; 85337b7f3c7SJiri Slaby struct inode *inode = file_inode(file); 85496fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(file); 85596fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 85696fd7ce5SGreg Kroah-Hartman 85737b7f3c7SJiri Slaby if (tty_paranoia_check(tty, inode, "tty_read")) 85896fd7ce5SGreg Kroah-Hartman return -EIO; 85918900ca6SPeter Hurley if (!tty || tty_io_error(tty)) 86096fd7ce5SGreg Kroah-Hartman return -EIO; 86196fd7ce5SGreg Kroah-Hartman 86296fd7ce5SGreg Kroah-Hartman /* We want to wait for the line discipline to sort out in this 86396fd7ce5SGreg Kroah-Hartman situation */ 86496fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 865e55afd11SPeter Hurley if (!ld) 866e55afd11SPeter Hurley return hung_up_tty_read(file, buf, count, ppos); 86796fd7ce5SGreg Kroah-Hartman if (ld->ops->read) 868c961bfb1SPeter Hurley i = ld->ops->read(tty, file, buf, count); 86996fd7ce5SGreg Kroah-Hartman else 87096fd7ce5SGreg Kroah-Hartman i = -EIO; 87196fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 872b0de59b5SJiri Slaby 873c884f871SArnd Bergmann if (i > 0) 874c884f871SArnd Bergmann tty_update_time(&inode->i_atime); 87537b7f3c7SJiri Slaby 87696fd7ce5SGreg Kroah-Hartman return i; 87796fd7ce5SGreg Kroah-Hartman } 87896fd7ce5SGreg Kroah-Hartman 879136d5258SPeter Hurley static void tty_write_unlock(struct tty_struct *tty) 88096fd7ce5SGreg Kroah-Hartman { 88196fd7ce5SGreg Kroah-Hartman mutex_unlock(&tty->atomic_write_lock); 882a9a08845SLinus Torvalds wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); 88396fd7ce5SGreg Kroah-Hartman } 88496fd7ce5SGreg Kroah-Hartman 885136d5258SPeter Hurley static int tty_write_lock(struct tty_struct *tty, int ndelay) 88696fd7ce5SGreg Kroah-Hartman { 88796fd7ce5SGreg Kroah-Hartman if (!mutex_trylock(&tty->atomic_write_lock)) { 88896fd7ce5SGreg Kroah-Hartman if (ndelay) 88996fd7ce5SGreg Kroah-Hartman return -EAGAIN; 89096fd7ce5SGreg Kroah-Hartman if (mutex_lock_interruptible(&tty->atomic_write_lock)) 89196fd7ce5SGreg Kroah-Hartman return -ERESTARTSYS; 89296fd7ce5SGreg Kroah-Hartman } 89396fd7ce5SGreg Kroah-Hartman return 0; 89496fd7ce5SGreg Kroah-Hartman } 89596fd7ce5SGreg Kroah-Hartman 89696fd7ce5SGreg Kroah-Hartman /* 89796fd7ce5SGreg Kroah-Hartman * Split writes up in sane blocksizes to avoid 89896fd7ce5SGreg Kroah-Hartman * denial-of-service type attacks 89996fd7ce5SGreg Kroah-Hartman */ 90096fd7ce5SGreg Kroah-Hartman static inline ssize_t do_tty_write( 90196fd7ce5SGreg Kroah-Hartman ssize_t (*write)(struct tty_struct *, struct file *, const unsigned char *, size_t), 90296fd7ce5SGreg Kroah-Hartman struct tty_struct *tty, 90396fd7ce5SGreg Kroah-Hartman struct file *file, 90496fd7ce5SGreg Kroah-Hartman const char __user *buf, 90596fd7ce5SGreg Kroah-Hartman size_t count) 90696fd7ce5SGreg Kroah-Hartman { 90796fd7ce5SGreg Kroah-Hartman ssize_t ret, written = 0; 90896fd7ce5SGreg Kroah-Hartman unsigned int chunk; 90996fd7ce5SGreg Kroah-Hartman 91096fd7ce5SGreg Kroah-Hartman ret = tty_write_lock(tty, file->f_flags & O_NDELAY); 91196fd7ce5SGreg Kroah-Hartman if (ret < 0) 91296fd7ce5SGreg Kroah-Hartman return ret; 91396fd7ce5SGreg Kroah-Hartman 91496fd7ce5SGreg Kroah-Hartman /* 91596fd7ce5SGreg Kroah-Hartman * We chunk up writes into a temporary buffer. This 91696fd7ce5SGreg Kroah-Hartman * simplifies low-level drivers immensely, since they 91796fd7ce5SGreg Kroah-Hartman * don't have locking issues and user mode accesses. 91896fd7ce5SGreg Kroah-Hartman * 91996fd7ce5SGreg Kroah-Hartman * But if TTY_NO_WRITE_SPLIT is set, we should use a 92096fd7ce5SGreg Kroah-Hartman * big chunk-size.. 92196fd7ce5SGreg Kroah-Hartman * 92296fd7ce5SGreg Kroah-Hartman * The default chunk-size is 2kB, because the NTTY 92396fd7ce5SGreg Kroah-Hartman * layer has problems with bigger chunks. It will 92496fd7ce5SGreg Kroah-Hartman * claim to be able to handle more characters than 92596fd7ce5SGreg Kroah-Hartman * it actually does. 92696fd7ce5SGreg Kroah-Hartman * 92796fd7ce5SGreg Kroah-Hartman * FIXME: This can probably go away now except that 64K chunks 92896fd7ce5SGreg Kroah-Hartman * are too likely to fail unless switched to vmalloc... 92996fd7ce5SGreg Kroah-Hartman */ 93096fd7ce5SGreg Kroah-Hartman chunk = 2048; 93196fd7ce5SGreg Kroah-Hartman if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags)) 93296fd7ce5SGreg Kroah-Hartman chunk = 65536; 93396fd7ce5SGreg Kroah-Hartman if (count < chunk) 93496fd7ce5SGreg Kroah-Hartman chunk = count; 93596fd7ce5SGreg Kroah-Hartman 93696fd7ce5SGreg Kroah-Hartman /* write_buf/write_cnt is protected by the atomic_write_lock mutex */ 93796fd7ce5SGreg Kroah-Hartman if (tty->write_cnt < chunk) { 93896fd7ce5SGreg Kroah-Hartman unsigned char *buf_chunk; 93996fd7ce5SGreg Kroah-Hartman 94096fd7ce5SGreg Kroah-Hartman if (chunk < 1024) 94196fd7ce5SGreg Kroah-Hartman chunk = 1024; 94296fd7ce5SGreg Kroah-Hartman 94396fd7ce5SGreg Kroah-Hartman buf_chunk = kmalloc(chunk, GFP_KERNEL); 94496fd7ce5SGreg Kroah-Hartman if (!buf_chunk) { 94596fd7ce5SGreg Kroah-Hartman ret = -ENOMEM; 94696fd7ce5SGreg Kroah-Hartman goto out; 94796fd7ce5SGreg Kroah-Hartman } 94896fd7ce5SGreg Kroah-Hartman kfree(tty->write_buf); 94996fd7ce5SGreg Kroah-Hartman tty->write_cnt = chunk; 95096fd7ce5SGreg Kroah-Hartman tty->write_buf = buf_chunk; 95196fd7ce5SGreg Kroah-Hartman } 95296fd7ce5SGreg Kroah-Hartman 95396fd7ce5SGreg Kroah-Hartman /* Do the write .. */ 95496fd7ce5SGreg Kroah-Hartman for (;;) { 95596fd7ce5SGreg Kroah-Hartman size_t size = count; 95696fd7ce5SGreg Kroah-Hartman if (size > chunk) 95796fd7ce5SGreg Kroah-Hartman size = chunk; 95896fd7ce5SGreg Kroah-Hartman ret = -EFAULT; 95996fd7ce5SGreg Kroah-Hartman if (copy_from_user(tty->write_buf, buf, size)) 96096fd7ce5SGreg Kroah-Hartman break; 96196fd7ce5SGreg Kroah-Hartman ret = write(tty, file, tty->write_buf, size); 96296fd7ce5SGreg Kroah-Hartman if (ret <= 0) 96396fd7ce5SGreg Kroah-Hartman break; 96496fd7ce5SGreg Kroah-Hartman written += ret; 96596fd7ce5SGreg Kroah-Hartman buf += ret; 96696fd7ce5SGreg Kroah-Hartman count -= ret; 96796fd7ce5SGreg Kroah-Hartman if (!count) 96896fd7ce5SGreg Kroah-Hartman break; 96996fd7ce5SGreg Kroah-Hartman ret = -ERESTARTSYS; 97096fd7ce5SGreg Kroah-Hartman if (signal_pending(current)) 97196fd7ce5SGreg Kroah-Hartman break; 97296fd7ce5SGreg Kroah-Hartman cond_resched(); 97396fd7ce5SGreg Kroah-Hartman } 97437b7f3c7SJiri Slaby if (written) { 975c884f871SArnd Bergmann tty_update_time(&file_inode(file)->i_mtime); 97696fd7ce5SGreg Kroah-Hartman ret = written; 97737b7f3c7SJiri Slaby } 97896fd7ce5SGreg Kroah-Hartman out: 97996fd7ce5SGreg Kroah-Hartman tty_write_unlock(tty); 98096fd7ce5SGreg Kroah-Hartman return ret; 98196fd7ce5SGreg Kroah-Hartman } 98296fd7ce5SGreg Kroah-Hartman 98396fd7ce5SGreg Kroah-Hartman /** 98496fd7ce5SGreg Kroah-Hartman * tty_write_message - write a message to a certain tty, not just the console. 98596fd7ce5SGreg Kroah-Hartman * @tty: the destination tty_struct 98696fd7ce5SGreg Kroah-Hartman * @msg: the message to write 98796fd7ce5SGreg Kroah-Hartman * 98896fd7ce5SGreg Kroah-Hartman * This is used for messages that need to be redirected to a specific tty. 98996fd7ce5SGreg Kroah-Hartman * We don't put it into the syslog queue right now maybe in the future if 99096fd7ce5SGreg Kroah-Hartman * really needed. 99196fd7ce5SGreg Kroah-Hartman * 99296fd7ce5SGreg Kroah-Hartman * We must still hold the BTM and test the CLOSING flag for the moment. 99396fd7ce5SGreg Kroah-Hartman */ 99496fd7ce5SGreg Kroah-Hartman 99596fd7ce5SGreg Kroah-Hartman void tty_write_message(struct tty_struct *tty, char *msg) 99696fd7ce5SGreg Kroah-Hartman { 99796fd7ce5SGreg Kroah-Hartman if (tty) { 99896fd7ce5SGreg Kroah-Hartman mutex_lock(&tty->atomic_write_lock); 99989c8d91eSAlan Cox tty_lock(tty); 10004b41b953SPeter Hurley if (tty->ops->write && tty->count > 0) 100196fd7ce5SGreg Kroah-Hartman tty->ops->write(tty, msg, strlen(msg)); 100289c8d91eSAlan Cox tty_unlock(tty); 100396fd7ce5SGreg Kroah-Hartman tty_write_unlock(tty); 100496fd7ce5SGreg Kroah-Hartman } 100596fd7ce5SGreg Kroah-Hartman return; 100696fd7ce5SGreg Kroah-Hartman } 100796fd7ce5SGreg Kroah-Hartman 100896fd7ce5SGreg Kroah-Hartman 100996fd7ce5SGreg Kroah-Hartman /** 101096fd7ce5SGreg Kroah-Hartman * tty_write - write method for tty device file 101196fd7ce5SGreg Kroah-Hartman * @file: tty file pointer 101296fd7ce5SGreg Kroah-Hartman * @buf: user data to write 101396fd7ce5SGreg Kroah-Hartman * @count: bytes to write 101496fd7ce5SGreg Kroah-Hartman * @ppos: unused 101596fd7ce5SGreg Kroah-Hartman * 101696fd7ce5SGreg Kroah-Hartman * Write data to a tty device via the line discipline. 101796fd7ce5SGreg Kroah-Hartman * 101896fd7ce5SGreg Kroah-Hartman * Locking: 101996fd7ce5SGreg Kroah-Hartman * Locks the line discipline as required 102096fd7ce5SGreg Kroah-Hartman * Writes to the tty driver are serialized by the atomic_write_lock 102196fd7ce5SGreg Kroah-Hartman * and are then processed in chunks to the device. The line discipline 102296fd7ce5SGreg Kroah-Hartman * write method will not be invoked in parallel for each device. 102396fd7ce5SGreg Kroah-Hartman */ 102496fd7ce5SGreg Kroah-Hartman 102596fd7ce5SGreg Kroah-Hartman static ssize_t tty_write(struct file *file, const char __user *buf, 102696fd7ce5SGreg Kroah-Hartman size_t count, loff_t *ppos) 102796fd7ce5SGreg Kroah-Hartman { 102896fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(file); 102996fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 103096fd7ce5SGreg Kroah-Hartman ssize_t ret; 103196fd7ce5SGreg Kroah-Hartman 10326131ffaaSAl Viro if (tty_paranoia_check(tty, file_inode(file), "tty_write")) 103396fd7ce5SGreg Kroah-Hartman return -EIO; 103418900ca6SPeter Hurley if (!tty || !tty->ops->write || tty_io_error(tty)) 103596fd7ce5SGreg Kroah-Hartman return -EIO; 103696fd7ce5SGreg Kroah-Hartman /* Short term debug to catch buggy drivers */ 103796fd7ce5SGreg Kroah-Hartman if (tty->ops->write_room == NULL) 1038339f36baSPeter Hurley tty_err(tty, "missing write_room method\n"); 103996fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 1040e55afd11SPeter Hurley if (!ld) 1041e55afd11SPeter Hurley return hung_up_tty_write(file, buf, count, ppos); 104296fd7ce5SGreg Kroah-Hartman if (!ld->ops->write) 104396fd7ce5SGreg Kroah-Hartman ret = -EIO; 104496fd7ce5SGreg Kroah-Hartman else 104596fd7ce5SGreg Kroah-Hartman ret = do_tty_write(ld->ops->write, tty, file, buf, count); 104696fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 104796fd7ce5SGreg Kroah-Hartman return ret; 104896fd7ce5SGreg Kroah-Hartman } 104996fd7ce5SGreg Kroah-Hartman 105096fd7ce5SGreg Kroah-Hartman ssize_t redirected_tty_write(struct file *file, const char __user *buf, 105196fd7ce5SGreg Kroah-Hartman size_t count, loff_t *ppos) 105296fd7ce5SGreg Kroah-Hartman { 105396fd7ce5SGreg Kroah-Hartman struct file *p = NULL; 105496fd7ce5SGreg Kroah-Hartman 105596fd7ce5SGreg Kroah-Hartman spin_lock(&redirect_lock); 1056cb0942b8SAl Viro if (redirect) 1057cb0942b8SAl Viro p = get_file(redirect); 105896fd7ce5SGreg Kroah-Hartman spin_unlock(&redirect_lock); 105996fd7ce5SGreg Kroah-Hartman 106096fd7ce5SGreg Kroah-Hartman if (p) { 106196fd7ce5SGreg Kroah-Hartman ssize_t res; 106296fd7ce5SGreg Kroah-Hartman res = vfs_write(p, buf, count, &p->f_pos); 106396fd7ce5SGreg Kroah-Hartman fput(p); 106496fd7ce5SGreg Kroah-Hartman return res; 106596fd7ce5SGreg Kroah-Hartman } 106696fd7ce5SGreg Kroah-Hartman return tty_write(file, buf, count, ppos); 106796fd7ce5SGreg Kroah-Hartman } 106896fd7ce5SGreg Kroah-Hartman 1069136d5258SPeter Hurley /** 1070136d5258SPeter Hurley * tty_send_xchar - send priority character 1071136d5258SPeter Hurley * 1072136d5258SPeter Hurley * Send a high priority character to the tty even if stopped 1073136d5258SPeter Hurley * 1074136d5258SPeter Hurley * Locking: none for xchar method, write ordering for write method. 1075136d5258SPeter Hurley */ 1076136d5258SPeter Hurley 1077136d5258SPeter Hurley int tty_send_xchar(struct tty_struct *tty, char ch) 1078136d5258SPeter Hurley { 1079136d5258SPeter Hurley int was_stopped = tty->stopped; 1080136d5258SPeter Hurley 1081136d5258SPeter Hurley if (tty->ops->send_xchar) { 1082ee0c1a65SPeter Hurley down_read(&tty->termios_rwsem); 1083136d5258SPeter Hurley tty->ops->send_xchar(tty, ch); 1084ee0c1a65SPeter Hurley up_read(&tty->termios_rwsem); 1085136d5258SPeter Hurley return 0; 1086136d5258SPeter Hurley } 1087136d5258SPeter Hurley 1088136d5258SPeter Hurley if (tty_write_lock(tty, 0) < 0) 1089136d5258SPeter Hurley return -ERESTARTSYS; 1090136d5258SPeter Hurley 1091ee0c1a65SPeter Hurley down_read(&tty->termios_rwsem); 1092136d5258SPeter Hurley if (was_stopped) 1093136d5258SPeter Hurley start_tty(tty); 1094136d5258SPeter Hurley tty->ops->write(tty, &ch, 1); 1095136d5258SPeter Hurley if (was_stopped) 1096136d5258SPeter Hurley stop_tty(tty); 1097ee0c1a65SPeter Hurley up_read(&tty->termios_rwsem); 1098136d5258SPeter Hurley tty_write_unlock(tty); 1099136d5258SPeter Hurley return 0; 1100136d5258SPeter Hurley } 1101136d5258SPeter Hurley 110296fd7ce5SGreg Kroah-Hartman static char ptychar[] = "pqrstuvwxyzabcde"; 110396fd7ce5SGreg Kroah-Hartman 110496fd7ce5SGreg Kroah-Hartman /** 110596fd7ce5SGreg Kroah-Hartman * pty_line_name - generate name for a pty 110696fd7ce5SGreg Kroah-Hartman * @driver: the tty driver in use 110796fd7ce5SGreg Kroah-Hartman * @index: the minor number 110896fd7ce5SGreg Kroah-Hartman * @p: output buffer of at least 6 bytes 110996fd7ce5SGreg Kroah-Hartman * 111096fd7ce5SGreg Kroah-Hartman * Generate a name from a driver reference and write it to the output 111196fd7ce5SGreg Kroah-Hartman * buffer. 111296fd7ce5SGreg Kroah-Hartman * 111396fd7ce5SGreg Kroah-Hartman * Locking: None 111496fd7ce5SGreg Kroah-Hartman */ 111596fd7ce5SGreg Kroah-Hartman static void pty_line_name(struct tty_driver *driver, int index, char *p) 111696fd7ce5SGreg Kroah-Hartman { 111796fd7ce5SGreg Kroah-Hartman int i = index + driver->name_base; 111896fd7ce5SGreg Kroah-Hartman /* ->name is initialized to "ttyp", but "tty" is expected */ 111996fd7ce5SGreg Kroah-Hartman sprintf(p, "%s%c%x", 112096fd7ce5SGreg Kroah-Hartman driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name, 112196fd7ce5SGreg Kroah-Hartman ptychar[i >> 4 & 0xf], i & 0xf); 112296fd7ce5SGreg Kroah-Hartman } 112396fd7ce5SGreg Kroah-Hartman 112496fd7ce5SGreg Kroah-Hartman /** 112596fd7ce5SGreg Kroah-Hartman * tty_line_name - generate name for a tty 112696fd7ce5SGreg Kroah-Hartman * @driver: the tty driver in use 112796fd7ce5SGreg Kroah-Hartman * @index: the minor number 112896fd7ce5SGreg Kroah-Hartman * @p: output buffer of at least 7 bytes 112996fd7ce5SGreg Kroah-Hartman * 113096fd7ce5SGreg Kroah-Hartman * Generate a name from a driver reference and write it to the output 11315c0a2450SGreg Kroah-Hartman * buffer. 113296fd7ce5SGreg Kroah-Hartman * 113396fd7ce5SGreg Kroah-Hartman * Locking: None 113496fd7ce5SGreg Kroah-Hartman */ 1135723abd87SHannes Reinecke static ssize_t tty_line_name(struct tty_driver *driver, int index, char *p) 113696fd7ce5SGreg Kroah-Hartman { 11370019b408SJiri Slaby if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE) 1138723abd87SHannes Reinecke return sprintf(p, "%s", driver->name); 11390019b408SJiri Slaby else 1140723abd87SHannes Reinecke return sprintf(p, "%s%d", driver->name, 1141723abd87SHannes Reinecke index + driver->name_base); 114296fd7ce5SGreg Kroah-Hartman } 114396fd7ce5SGreg Kroah-Hartman 114496fd7ce5SGreg Kroah-Hartman /** 114596fd7ce5SGreg Kroah-Hartman * tty_driver_lookup_tty() - find an existing tty, if any 114696fd7ce5SGreg Kroah-Hartman * @driver: the driver for the tty 114796fd7ce5SGreg Kroah-Hartman * @idx: the minor number 114896fd7ce5SGreg Kroah-Hartman * 1149aa3cb814SPeter Hurley * Return the tty, if found. If not found, return NULL or ERR_PTR() if the 1150aa3cb814SPeter Hurley * driver lookup() method returns an error. 115196fd7ce5SGreg Kroah-Hartman * 1152aa3cb814SPeter Hurley * Locking: tty_mutex must be held. If the tty is found, bump the tty kref. 115396fd7ce5SGreg Kroah-Hartman */ 115496fd7ce5SGreg Kroah-Hartman static struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver, 11558ead9dd5SLinus Torvalds struct file *file, int idx) 115696fd7ce5SGreg Kroah-Hartman { 1157aa3cb814SPeter Hurley struct tty_struct *tty; 115896fd7ce5SGreg Kroah-Hartman 1159aa3cb814SPeter Hurley if (driver->ops->lookup) 116012e84c71SOkash Khawaja if (!file) 116112e84c71SOkash Khawaja tty = ERR_PTR(-EIO); 116212e84c71SOkash Khawaja else 11638ead9dd5SLinus Torvalds tty = driver->ops->lookup(driver, file, idx); 1164aa3cb814SPeter Hurley else 1165aa3cb814SPeter Hurley tty = driver->ttys[idx]; 1166aa3cb814SPeter Hurley 1167aa3cb814SPeter Hurley if (!IS_ERR(tty)) 1168aa3cb814SPeter Hurley tty_kref_get(tty); 1169aa3cb814SPeter Hurley return tty; 117096fd7ce5SGreg Kroah-Hartman } 117196fd7ce5SGreg Kroah-Hartman 117296fd7ce5SGreg Kroah-Hartman /** 117396fd7ce5SGreg Kroah-Hartman * tty_init_termios - helper for termios setup 117496fd7ce5SGreg Kroah-Hartman * @tty: the tty to set up 117596fd7ce5SGreg Kroah-Hartman * 11768daa89e0SJohan Hovold * Initialise the termios structure for this tty. This runs under 117796fd7ce5SGreg Kroah-Hartman * the tty_mutex currently so we can be relaxed about ordering. 117896fd7ce5SGreg Kroah-Hartman */ 117996fd7ce5SGreg Kroah-Hartman 1180a3123fd0SPeter Hurley void tty_init_termios(struct tty_struct *tty) 118196fd7ce5SGreg Kroah-Hartman { 118296fd7ce5SGreg Kroah-Hartman struct ktermios *tp; 118396fd7ce5SGreg Kroah-Hartman int idx = tty->index; 118496fd7ce5SGreg Kroah-Hartman 118536b3c070SAlan Cox if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) 118636b3c070SAlan Cox tty->termios = tty->driver->init_termios; 118736b3c070SAlan Cox else { 118836b3c070SAlan Cox /* Check for lazy saved data */ 118996fd7ce5SGreg Kroah-Hartman tp = tty->driver->termios[idx]; 1190ece53405SPeter Hurley if (tp != NULL) { 1191adc8d746SAlan Cox tty->termios = *tp; 1192ece53405SPeter Hurley tty->termios.c_line = tty->driver->init_termios.c_line; 1193ece53405SPeter Hurley } else 119436b3c070SAlan Cox tty->termios = tty->driver->init_termios; 119536b3c070SAlan Cox } 119696fd7ce5SGreg Kroah-Hartman /* Compatibility until drivers always set this */ 1197adc8d746SAlan Cox tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios); 1198adc8d746SAlan Cox tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios); 119996fd7ce5SGreg Kroah-Hartman } 120096fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(tty_init_termios); 120196fd7ce5SGreg Kroah-Hartman 120266d450e8SJiri Slaby int tty_standard_install(struct tty_driver *driver, struct tty_struct *tty) 120366d450e8SJiri Slaby { 1204a3123fd0SPeter Hurley tty_init_termios(tty); 120566d450e8SJiri Slaby tty_driver_kref_get(driver); 120666d450e8SJiri Slaby tty->count++; 120766d450e8SJiri Slaby driver->ttys[tty->index] = tty; 120866d450e8SJiri Slaby return 0; 120966d450e8SJiri Slaby } 121066d450e8SJiri Slaby EXPORT_SYMBOL_GPL(tty_standard_install); 121166d450e8SJiri Slaby 121296fd7ce5SGreg Kroah-Hartman /** 121396fd7ce5SGreg Kroah-Hartman * tty_driver_install_tty() - install a tty entry in the driver 121496fd7ce5SGreg Kroah-Hartman * @driver: the driver for the tty 121596fd7ce5SGreg Kroah-Hartman * @tty: the tty 121696fd7ce5SGreg Kroah-Hartman * 121796fd7ce5SGreg Kroah-Hartman * Install a tty object into the driver tables. The tty->index field 121896fd7ce5SGreg Kroah-Hartman * will be set by the time this is called. This method is responsible 121996fd7ce5SGreg Kroah-Hartman * for ensuring any need additional structures are allocated and 122096fd7ce5SGreg Kroah-Hartman * configured. 122196fd7ce5SGreg Kroah-Hartman * 122296fd7ce5SGreg Kroah-Hartman * Locking: tty_mutex for now 122396fd7ce5SGreg Kroah-Hartman */ 122496fd7ce5SGreg Kroah-Hartman static int tty_driver_install_tty(struct tty_driver *driver, 122596fd7ce5SGreg Kroah-Hartman struct tty_struct *tty) 122696fd7ce5SGreg Kroah-Hartman { 122766d450e8SJiri Slaby return driver->ops->install ? driver->ops->install(driver, tty) : 122866d450e8SJiri Slaby tty_standard_install(driver, tty); 122996fd7ce5SGreg Kroah-Hartman } 123096fd7ce5SGreg Kroah-Hartman 123196fd7ce5SGreg Kroah-Hartman /** 123296fd7ce5SGreg Kroah-Hartman * tty_driver_remove_tty() - remove a tty from the driver tables 123396fd7ce5SGreg Kroah-Hartman * @driver: the driver for the tty 123496fd7ce5SGreg Kroah-Hartman * @idx: the minor number 123596fd7ce5SGreg Kroah-Hartman * 123696fd7ce5SGreg Kroah-Hartman * Remvoe a tty object from the driver tables. The tty->index field 123796fd7ce5SGreg Kroah-Hartman * will be set by the time this is called. 123896fd7ce5SGreg Kroah-Hartman * 123996fd7ce5SGreg Kroah-Hartman * Locking: tty_mutex for now 124096fd7ce5SGreg Kroah-Hartman */ 124105de87edSPeter Hurley static void tty_driver_remove_tty(struct tty_driver *driver, struct tty_struct *tty) 124296fd7ce5SGreg Kroah-Hartman { 124396fd7ce5SGreg Kroah-Hartman if (driver->ops->remove) 124496fd7ce5SGreg Kroah-Hartman driver->ops->remove(driver, tty); 124596fd7ce5SGreg Kroah-Hartman else 124696fd7ce5SGreg Kroah-Hartman driver->ttys[tty->index] = NULL; 124796fd7ce5SGreg Kroah-Hartman } 124896fd7ce5SGreg Kroah-Hartman 124996fd7ce5SGreg Kroah-Hartman /* 125096fd7ce5SGreg Kroah-Hartman * tty_reopen() - fast re-open of an open tty 125196fd7ce5SGreg Kroah-Hartman * @tty - the tty to open 125296fd7ce5SGreg Kroah-Hartman * 125396fd7ce5SGreg Kroah-Hartman * Return 0 on success, -errno on error. 12545d93e748SPeter Hurley * Re-opens on master ptys are not allowed and return -EIO. 125596fd7ce5SGreg Kroah-Hartman * 12565d93e748SPeter Hurley * Locking: Caller must hold tty_lock 125796fd7ce5SGreg Kroah-Hartman */ 125896fd7ce5SGreg Kroah-Hartman static int tty_reopen(struct tty_struct *tty) 125996fd7ce5SGreg Kroah-Hartman { 126096fd7ce5SGreg Kroah-Hartman struct tty_driver *driver = tty->driver; 1261d3736d82SDmitry Safonov struct tty_ldisc *ld; 1262d3736d82SDmitry Safonov int retval = 0; 126396fd7ce5SGreg Kroah-Hartman 126496fd7ce5SGreg Kroah-Hartman if (driver->type == TTY_DRIVER_TYPE_PTY && 12655d93e748SPeter Hurley driver->subtype == PTY_TYPE_MASTER) 126696fd7ce5SGreg Kroah-Hartman return -EIO; 126796fd7ce5SGreg Kroah-Hartman 12687f22f6c9SPeter Hurley if (!tty->count) 12697f22f6c9SPeter Hurley return -EAGAIN; 12707f22f6c9SPeter Hurley 127186f2c00fSPeter Hurley if (test_bit(TTY_EXCLUSIVE, &tty->flags) && !capable(CAP_SYS_ADMIN)) 127286f2c00fSPeter Hurley return -EBUSY; 127386f2c00fSPeter Hurley 1274d3736d82SDmitry Safonov ld = tty_ldisc_ref_wait(tty); 1275d3736d82SDmitry Safonov if (ld) { 1276d3736d82SDmitry Safonov tty_ldisc_deref(ld); 1277d3736d82SDmitry Safonov } else { 127883d817f4SDmitry Safonov retval = tty_ldisc_lock(tty, 5 * HZ); 127983d817f4SDmitry Safonov if (retval) 128083d817f4SDmitry Safonov return retval; 128196fd7ce5SGreg Kroah-Hartman 1282cf62a1a1SDmitry Safonov if (!tty->ldisc) 1283fe324167SDmitry Safonov retval = tty_ldisc_reinit(tty, tty->termios.c_line); 128483d817f4SDmitry Safonov tty_ldisc_unlock(tty); 1285d3736d82SDmitry Safonov } 1286cf62a1a1SDmitry Safonov 1287cf62a1a1SDmitry Safonov if (retval == 0) 1288cf62a1a1SDmitry Safonov tty->count++; 1289cf62a1a1SDmitry Safonov 1290fe324167SDmitry Safonov return retval; 129196fd7ce5SGreg Kroah-Hartman } 129296fd7ce5SGreg Kroah-Hartman 129396fd7ce5SGreg Kroah-Hartman /** 129496fd7ce5SGreg Kroah-Hartman * tty_init_dev - initialise a tty device 129596fd7ce5SGreg Kroah-Hartman * @driver: tty driver we are opening a device on 129696fd7ce5SGreg Kroah-Hartman * @idx: device index 129796fd7ce5SGreg Kroah-Hartman * @ret_tty: returned tty structure 129896fd7ce5SGreg Kroah-Hartman * 129996fd7ce5SGreg Kroah-Hartman * Prepare a tty device. This may not be a "new" clean device but 130096fd7ce5SGreg Kroah-Hartman * could also be an active device. The pty drivers require special 130196fd7ce5SGreg Kroah-Hartman * handling because of this. 130296fd7ce5SGreg Kroah-Hartman * 130396fd7ce5SGreg Kroah-Hartman * Locking: 130496fd7ce5SGreg Kroah-Hartman * The function is called under the tty_mutex, which 130596fd7ce5SGreg Kroah-Hartman * protects us from the tty struct or driver itself going away. 130696fd7ce5SGreg Kroah-Hartman * 130796fd7ce5SGreg Kroah-Hartman * On exit the tty device has the line discipline attached and 130896fd7ce5SGreg Kroah-Hartman * a reference count of 1. If a pair was created for pty/tty use 130996fd7ce5SGreg Kroah-Hartman * and the other was a pty master then it too has a reference count of 1. 131096fd7ce5SGreg Kroah-Hartman * 131196fd7ce5SGreg Kroah-Hartman * WSH 06/09/97: Rewritten to remove races and properly clean up after a 131296fd7ce5SGreg Kroah-Hartman * failed open. The new code protects the open with a mutex, so it's 131396fd7ce5SGreg Kroah-Hartman * really quite straightforward. The mutex locking can probably be 131496fd7ce5SGreg Kroah-Hartman * relaxed for the (most common) case of reopening a tty. 131596fd7ce5SGreg Kroah-Hartman */ 131696fd7ce5SGreg Kroah-Hartman 1317593a27c4SKonstantin Khlebnikov struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx) 131896fd7ce5SGreg Kroah-Hartman { 131996fd7ce5SGreg Kroah-Hartman struct tty_struct *tty; 132096fd7ce5SGreg Kroah-Hartman int retval; 132196fd7ce5SGreg Kroah-Hartman 132296fd7ce5SGreg Kroah-Hartman /* 132396fd7ce5SGreg Kroah-Hartman * First time open is complex, especially for PTY devices. 132496fd7ce5SGreg Kroah-Hartman * This code guarantees that either everything succeeds and the 132596fd7ce5SGreg Kroah-Hartman * TTY is ready for operation, or else the table slots are vacated 132696fd7ce5SGreg Kroah-Hartman * and the allocated memory released. (Except that the termios 132716b00ae8SJohan Hovold * may be retained.) 132896fd7ce5SGreg Kroah-Hartman */ 132996fd7ce5SGreg Kroah-Hartman 133096fd7ce5SGreg Kroah-Hartman if (!try_module_get(driver->owner)) 133196fd7ce5SGreg Kroah-Hartman return ERR_PTR(-ENODEV); 133296fd7ce5SGreg Kroah-Hartman 13332c964a2fSRasmus Villemoes tty = alloc_tty_struct(driver, idx); 1334d5543503SJiri Slaby if (!tty) { 1335d5543503SJiri Slaby retval = -ENOMEM; 1336d5543503SJiri Slaby goto err_module_put; 1337d5543503SJiri Slaby } 133896fd7ce5SGreg Kroah-Hartman 133989c8d91eSAlan Cox tty_lock(tty); 134096fd7ce5SGreg Kroah-Hartman retval = tty_driver_install_tty(driver, tty); 1341d5543503SJiri Slaby if (retval < 0) 1342c8b710b3SPeter Hurley goto err_free_tty; 134396fd7ce5SGreg Kroah-Hartman 134404831dc1SJiri Slaby if (!tty->port) 134504831dc1SJiri Slaby tty->port = driver->ports[idx]; 134604831dc1SJiri Slaby 13475d4121c0SJiri Slaby WARN_RATELIMIT(!tty->port, 13485d4121c0SJiri Slaby "%s: %s driver does not set tty->port. This will crash the kernel later. Fix the driver!\n", 13495d4121c0SJiri Slaby __func__, tty->driver->name); 13505d4121c0SJiri Slaby 1351b027e229SGaurav Kohli retval = tty_ldisc_lock(tty, 5 * HZ); 1352b027e229SGaurav Kohli if (retval) 1353b027e229SGaurav Kohli goto err_release_lock; 1354967fab69SJiri Slaby tty->port->itty = tty; 1355967fab69SJiri Slaby 135696fd7ce5SGreg Kroah-Hartman /* 135796fd7ce5SGreg Kroah-Hartman * Structures all installed ... call the ldisc open routines. 135896fd7ce5SGreg Kroah-Hartman * If we fail here just call release_tty to clean up. No need 135996fd7ce5SGreg Kroah-Hartman * to decrement the use counts, as release_tty doesn't care. 136096fd7ce5SGreg Kroah-Hartman */ 136196fd7ce5SGreg Kroah-Hartman retval = tty_ldisc_setup(tty, tty->link); 136296fd7ce5SGreg Kroah-Hartman if (retval) 1363d5543503SJiri Slaby goto err_release_tty; 1364b027e229SGaurav Kohli tty_ldisc_unlock(tty); 136589c8d91eSAlan Cox /* Return the tty locked so that it cannot vanish under the caller */ 136696fd7ce5SGreg Kroah-Hartman return tty; 136796fd7ce5SGreg Kroah-Hartman 1368c8b710b3SPeter Hurley err_free_tty: 136989c8d91eSAlan Cox tty_unlock(tty); 1370d5543503SJiri Slaby free_tty_struct(tty); 1371d5543503SJiri Slaby err_module_put: 137296fd7ce5SGreg Kroah-Hartman module_put(driver->owner); 1373d5543503SJiri Slaby return ERR_PTR(retval); 137496fd7ce5SGreg Kroah-Hartman 137596fd7ce5SGreg Kroah-Hartman /* call the tty release_tty routine to clean out this slot */ 1376d5543503SJiri Slaby err_release_tty: 1377b027e229SGaurav Kohli tty_ldisc_unlock(tty); 1378339f36baSPeter Hurley tty_info_ratelimited(tty, "ldisc open failed (%d), clearing slot %d\n", 1379339f36baSPeter Hurley retval, idx); 1380b027e229SGaurav Kohli err_release_lock: 1381b027e229SGaurav Kohli tty_unlock(tty); 138296fd7ce5SGreg Kroah-Hartman release_tty(tty, idx); 138396fd7ce5SGreg Kroah-Hartman return ERR_PTR(retval); 138496fd7ce5SGreg Kroah-Hartman } 138596fd7ce5SGreg Kroah-Hartman 1386f51ccf46SJohan Hovold /** 1387f51ccf46SJohan Hovold * tty_save_termios() - save tty termios data in driver table 1388f51ccf46SJohan Hovold * @tty: tty whose termios data to save 1389f51ccf46SJohan Hovold * 1390f51ccf46SJohan Hovold * Locking: Caller guarantees serialisation with tty_init_termios(). 1391f51ccf46SJohan Hovold */ 1392f51ccf46SJohan Hovold void tty_save_termios(struct tty_struct *tty) 139396fd7ce5SGreg Kroah-Hartman { 139496fd7ce5SGreg Kroah-Hartman struct ktermios *tp; 139596fd7ce5SGreg Kroah-Hartman int idx = tty->index; 139636b3c070SAlan Cox 139736b3c070SAlan Cox /* If the port is going to reset then it has no termios to save */ 139836b3c070SAlan Cox if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) 139936b3c070SAlan Cox return; 140036b3c070SAlan Cox 140136b3c070SAlan Cox /* Stash the termios data */ 1402adc8d746SAlan Cox tp = tty->driver->termios[idx]; 140336b3c070SAlan Cox if (tp == NULL) { 140436b3c070SAlan Cox tp = kmalloc(sizeof(struct ktermios), GFP_KERNEL); 140525080652SPeter Hurley if (tp == NULL) 140636b3c070SAlan Cox return; 14074ac5d705SDan Carpenter tty->driver->termios[idx] = tp; 140836b3c070SAlan Cox } 140936b3c070SAlan Cox *tp = tty->termios; 141096fd7ce5SGreg Kroah-Hartman } 1411f51ccf46SJohan Hovold EXPORT_SYMBOL_GPL(tty_save_termios); 141296fd7ce5SGreg Kroah-Hartman 1413a2965b7bSPeter Hurley /** 1414949aa64fSPeter Hurley * tty_flush_works - flush all works of a tty/pty pair 1415949aa64fSPeter Hurley * @tty: tty device to flush works for (or either end of a pty pair) 1416a2965b7bSPeter Hurley * 1417949aa64fSPeter Hurley * Sync flush all works belonging to @tty (and the 'other' tty). 1418a2965b7bSPeter Hurley */ 1419a2965b7bSPeter Hurley static void tty_flush_works(struct tty_struct *tty) 1420a2965b7bSPeter Hurley { 1421a2965b7bSPeter Hurley flush_work(&tty->SAK_work); 1422a2965b7bSPeter Hurley flush_work(&tty->hangup_work); 1423949aa64fSPeter Hurley if (tty->link) { 1424949aa64fSPeter Hurley flush_work(&tty->link->SAK_work); 1425949aa64fSPeter Hurley flush_work(&tty->link->hangup_work); 1426949aa64fSPeter Hurley } 1427a2965b7bSPeter Hurley } 142896fd7ce5SGreg Kroah-Hartman 142996fd7ce5SGreg Kroah-Hartman /** 143096fd7ce5SGreg Kroah-Hartman * release_one_tty - release tty structure memory 143196fd7ce5SGreg Kroah-Hartman * @kref: kref of tty we are obliterating 143296fd7ce5SGreg Kroah-Hartman * 143396fd7ce5SGreg Kroah-Hartman * Releases memory associated with a tty structure, and clears out the 143496fd7ce5SGreg Kroah-Hartman * driver table slots. This function is called when a device is no longer 143596fd7ce5SGreg Kroah-Hartman * in use. It also gets called when setup of a device fails. 143696fd7ce5SGreg Kroah-Hartman * 143796fd7ce5SGreg Kroah-Hartman * Locking: 143896fd7ce5SGreg Kroah-Hartman * takes the file list lock internally when working on the list 143996fd7ce5SGreg Kroah-Hartman * of ttys that the driver keeps. 144096fd7ce5SGreg Kroah-Hartman * 144196fd7ce5SGreg Kroah-Hartman * This method gets called from a work queue so that the driver private 144296fd7ce5SGreg Kroah-Hartman * cleanup ops can sleep (needed for USB at least) 144396fd7ce5SGreg Kroah-Hartman */ 144496fd7ce5SGreg Kroah-Hartman static void release_one_tty(struct work_struct *work) 144596fd7ce5SGreg Kroah-Hartman { 144696fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = 144796fd7ce5SGreg Kroah-Hartman container_of(work, struct tty_struct, hangup_work); 144896fd7ce5SGreg Kroah-Hartman struct tty_driver *driver = tty->driver; 1449b216df53SCyrill Gorcunov struct module *owner = driver->owner; 145096fd7ce5SGreg Kroah-Hartman 145196fd7ce5SGreg Kroah-Hartman if (tty->ops->cleanup) 145296fd7ce5SGreg Kroah-Hartman tty->ops->cleanup(tty); 145396fd7ce5SGreg Kroah-Hartman 145496fd7ce5SGreg Kroah-Hartman tty->magic = 0; 145596fd7ce5SGreg Kroah-Hartman tty_driver_kref_put(driver); 1456b216df53SCyrill Gorcunov module_put(owner); 145796fd7ce5SGreg Kroah-Hartman 14584a510969SPeter Hurley spin_lock(&tty->files_lock); 145996fd7ce5SGreg Kroah-Hartman list_del_init(&tty->tty_files); 14604a510969SPeter Hurley spin_unlock(&tty->files_lock); 146196fd7ce5SGreg Kroah-Hartman 146296fd7ce5SGreg Kroah-Hartman put_pid(tty->pgrp); 146396fd7ce5SGreg Kroah-Hartman put_pid(tty->session); 146496fd7ce5SGreg Kroah-Hartman free_tty_struct(tty); 146596fd7ce5SGreg Kroah-Hartman } 146696fd7ce5SGreg Kroah-Hartman 146796fd7ce5SGreg Kroah-Hartman static void queue_release_one_tty(struct kref *kref) 146896fd7ce5SGreg Kroah-Hartman { 146996fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = container_of(kref, struct tty_struct, kref); 147096fd7ce5SGreg Kroah-Hartman 147196fd7ce5SGreg Kroah-Hartman /* The hangup queue is now free so we can reuse it rather than 147296fd7ce5SGreg Kroah-Hartman waste a chunk of memory for each port */ 147396fd7ce5SGreg Kroah-Hartman INIT_WORK(&tty->hangup_work, release_one_tty); 147496fd7ce5SGreg Kroah-Hartman schedule_work(&tty->hangup_work); 147596fd7ce5SGreg Kroah-Hartman } 147696fd7ce5SGreg Kroah-Hartman 147796fd7ce5SGreg Kroah-Hartman /** 147896fd7ce5SGreg Kroah-Hartman * tty_kref_put - release a tty kref 147996fd7ce5SGreg Kroah-Hartman * @tty: tty device 148096fd7ce5SGreg Kroah-Hartman * 148196fd7ce5SGreg Kroah-Hartman * Release a reference to a tty device and if need be let the kref 148296fd7ce5SGreg Kroah-Hartman * layer destruct the object for us 148396fd7ce5SGreg Kroah-Hartman */ 148496fd7ce5SGreg Kroah-Hartman 148596fd7ce5SGreg Kroah-Hartman void tty_kref_put(struct tty_struct *tty) 148696fd7ce5SGreg Kroah-Hartman { 148796fd7ce5SGreg Kroah-Hartman if (tty) 148896fd7ce5SGreg Kroah-Hartman kref_put(&tty->kref, queue_release_one_tty); 148996fd7ce5SGreg Kroah-Hartman } 149096fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_kref_put); 149196fd7ce5SGreg Kroah-Hartman 149296fd7ce5SGreg Kroah-Hartman /** 149396fd7ce5SGreg Kroah-Hartman * release_tty - release tty structure memory 149496fd7ce5SGreg Kroah-Hartman * 149596fd7ce5SGreg Kroah-Hartman * Release both @tty and a possible linked partner (think pty pair), 149696fd7ce5SGreg Kroah-Hartman * and decrement the refcount of the backing module. 149796fd7ce5SGreg Kroah-Hartman * 149896fd7ce5SGreg Kroah-Hartman * Locking: 1499d155255aSAlan Cox * tty_mutex 150096fd7ce5SGreg Kroah-Hartman * takes the file list lock internally when working on the list 150196fd7ce5SGreg Kroah-Hartman * of ttys that the driver keeps. 150296fd7ce5SGreg Kroah-Hartman * 150396fd7ce5SGreg Kroah-Hartman */ 150496fd7ce5SGreg Kroah-Hartman static void release_tty(struct tty_struct *tty, int idx) 150596fd7ce5SGreg Kroah-Hartman { 150696fd7ce5SGreg Kroah-Hartman /* This should always be true but check for the moment */ 150796fd7ce5SGreg Kroah-Hartman WARN_ON(tty->index != idx); 1508d155255aSAlan Cox WARN_ON(!mutex_is_locked(&tty_mutex)); 150936b3c070SAlan Cox if (tty->ops->shutdown) 151036b3c070SAlan Cox tty->ops->shutdown(tty); 1511f51ccf46SJohan Hovold tty_save_termios(tty); 151236b3c070SAlan Cox tty_driver_remove_tty(tty->driver, tty); 1513967fab69SJiri Slaby tty->port->itty = NULL; 151464e377dcSPeter Hurley if (tty->link) 151564e377dcSPeter Hurley tty->link->port->itty = NULL; 1516e176058fSPeter Hurley tty_buffer_cancel_work(tty->port); 15172b022ab7SSahara if (tty->link) 15182b022ab7SSahara tty_buffer_cancel_work(tty->link->port); 151936b3c070SAlan Cox 152096fd7ce5SGreg Kroah-Hartman tty_kref_put(tty->link); 152196fd7ce5SGreg Kroah-Hartman tty_kref_put(tty); 152296fd7ce5SGreg Kroah-Hartman } 152396fd7ce5SGreg Kroah-Hartman 152496fd7ce5SGreg Kroah-Hartman /** 1525955787caSJiri Slaby * tty_release_checks - check a tty before real release 1526955787caSJiri Slaby * @tty: tty to check 1527955787caSJiri Slaby * @o_tty: link of @tty (if any) 1528955787caSJiri Slaby * @idx: index of the tty 1529955787caSJiri Slaby * 1530955787caSJiri Slaby * Performs some paranoid checking before true release of the @tty. 1531955787caSJiri Slaby * This is a no-op unless TTY_PARANOIA_CHECK is defined. 1532955787caSJiri Slaby */ 1533359b9fb5SPeter Hurley static int tty_release_checks(struct tty_struct *tty, int idx) 1534955787caSJiri Slaby { 1535955787caSJiri Slaby #ifdef TTY_PARANOIA_CHECK 1536955787caSJiri Slaby if (idx < 0 || idx >= tty->driver->num) { 1537e2dfa3d3SPeter Hurley tty_debug(tty, "bad idx %d\n", idx); 1538955787caSJiri Slaby return -1; 1539955787caSJiri Slaby } 1540955787caSJiri Slaby 1541955787caSJiri Slaby /* not much to check for devpts */ 1542955787caSJiri Slaby if (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) 1543955787caSJiri Slaby return 0; 1544955787caSJiri Slaby 1545955787caSJiri Slaby if (tty != tty->driver->ttys[idx]) { 1546e2dfa3d3SPeter Hurley tty_debug(tty, "bad driver table[%d] = %p\n", 1547e2dfa3d3SPeter Hurley idx, tty->driver->ttys[idx]); 1548955787caSJiri Slaby return -1; 1549955787caSJiri Slaby } 1550955787caSJiri Slaby if (tty->driver->other) { 1551359b9fb5SPeter Hurley struct tty_struct *o_tty = tty->link; 1552359b9fb5SPeter Hurley 1553955787caSJiri Slaby if (o_tty != tty->driver->other->ttys[idx]) { 1554e2dfa3d3SPeter Hurley tty_debug(tty, "bad other table[%d] = %p\n", 1555e2dfa3d3SPeter Hurley idx, tty->driver->other->ttys[idx]); 1556955787caSJiri Slaby return -1; 1557955787caSJiri Slaby } 1558955787caSJiri Slaby if (o_tty->link != tty) { 1559e2dfa3d3SPeter Hurley tty_debug(tty, "bad link = %p\n", o_tty->link); 1560955787caSJiri Slaby return -1; 1561955787caSJiri Slaby } 1562955787caSJiri Slaby } 1563955787caSJiri Slaby #endif 1564955787caSJiri Slaby return 0; 1565955787caSJiri Slaby } 1566955787caSJiri Slaby 1567955787caSJiri Slaby /** 1568a09ac397SOkash Khawaja * tty_kclose - closes tty opened by tty_kopen 1569a09ac397SOkash Khawaja * @tty: tty device 1570a09ac397SOkash Khawaja * 1571a09ac397SOkash Khawaja * Performs the final steps to release and free a tty device. It is the 1572a09ac397SOkash Khawaja * same as tty_release_struct except that it also resets TTY_PORT_KOPENED 1573a09ac397SOkash Khawaja * flag on tty->port. 1574a09ac397SOkash Khawaja */ 1575a09ac397SOkash Khawaja void tty_kclose(struct tty_struct *tty) 1576a09ac397SOkash Khawaja { 1577a09ac397SOkash Khawaja /* 1578a09ac397SOkash Khawaja * Ask the line discipline code to release its structures 1579a09ac397SOkash Khawaja */ 1580a09ac397SOkash Khawaja tty_ldisc_release(tty); 1581a09ac397SOkash Khawaja 1582a09ac397SOkash Khawaja /* Wait for pending work before tty destruction commmences */ 1583a09ac397SOkash Khawaja tty_flush_works(tty); 1584a09ac397SOkash Khawaja 1585a09ac397SOkash Khawaja tty_debug_hangup(tty, "freeing structure\n"); 1586a09ac397SOkash Khawaja /* 1587a09ac397SOkash Khawaja * The release_tty function takes care of the details of clearing 1588a09ac397SOkash Khawaja * the slots and preserving the termios structure. The tty_unlock_pair 1589a09ac397SOkash Khawaja * should be safe as we keep a kref while the tty is locked (so the 1590a09ac397SOkash Khawaja * unlock never unlocks a freed tty). 1591a09ac397SOkash Khawaja */ 1592a09ac397SOkash Khawaja mutex_lock(&tty_mutex); 1593a09ac397SOkash Khawaja tty_port_set_kopened(tty->port, 0); 1594a09ac397SOkash Khawaja release_tty(tty, tty->index); 1595a09ac397SOkash Khawaja mutex_unlock(&tty_mutex); 1596a09ac397SOkash Khawaja } 1597a09ac397SOkash Khawaja EXPORT_SYMBOL_GPL(tty_kclose); 1598a09ac397SOkash Khawaja 1599a09ac397SOkash Khawaja /** 16009ed90d20SRob Herring * tty_release_struct - release a tty struct 16019ed90d20SRob Herring * @tty: tty device 16029ed90d20SRob Herring * @idx: index of the tty 16039ed90d20SRob Herring * 16049ed90d20SRob Herring * Performs the final steps to release and free a tty device. It is 16059ed90d20SRob Herring * roughly the reverse of tty_init_dev. 16069ed90d20SRob Herring */ 16079ed90d20SRob Herring void tty_release_struct(struct tty_struct *tty, int idx) 16089ed90d20SRob Herring { 16099ed90d20SRob Herring /* 16109ed90d20SRob Herring * Ask the line discipline code to release its structures 16119ed90d20SRob Herring */ 16129ed90d20SRob Herring tty_ldisc_release(tty); 16139ed90d20SRob Herring 16149ed90d20SRob Herring /* Wait for pending work before tty destruction commmences */ 16159ed90d20SRob Herring tty_flush_works(tty); 16169ed90d20SRob Herring 16179ed90d20SRob Herring tty_debug_hangup(tty, "freeing structure\n"); 16189ed90d20SRob Herring /* 16199ed90d20SRob Herring * The release_tty function takes care of the details of clearing 16209ed90d20SRob Herring * the slots and preserving the termios structure. The tty_unlock_pair 16219ed90d20SRob Herring * should be safe as we keep a kref while the tty is locked (so the 16229ed90d20SRob Herring * unlock never unlocks a freed tty). 16239ed90d20SRob Herring */ 16249ed90d20SRob Herring mutex_lock(&tty_mutex); 16259ed90d20SRob Herring release_tty(tty, idx); 16269ed90d20SRob Herring mutex_unlock(&tty_mutex); 16279ed90d20SRob Herring } 16289ed90d20SRob Herring EXPORT_SYMBOL_GPL(tty_release_struct); 16299ed90d20SRob Herring 16309ed90d20SRob Herring /** 163196fd7ce5SGreg Kroah-Hartman * tty_release - vfs callback for close 163296fd7ce5SGreg Kroah-Hartman * @inode: inode of tty 163396fd7ce5SGreg Kroah-Hartman * @filp: file pointer for handle to tty 163496fd7ce5SGreg Kroah-Hartman * 163596fd7ce5SGreg Kroah-Hartman * Called the last time each file handle is closed that references 163696fd7ce5SGreg Kroah-Hartman * this tty. There may however be several such references. 163796fd7ce5SGreg Kroah-Hartman * 163896fd7ce5SGreg Kroah-Hartman * Locking: 163996fd7ce5SGreg Kroah-Hartman * Takes bkl. See tty_release_dev 164096fd7ce5SGreg Kroah-Hartman * 164196fd7ce5SGreg Kroah-Hartman * Even releasing the tty structures is a tricky business.. We have 164296fd7ce5SGreg Kroah-Hartman * to be very careful that the structures are all released at the 164396fd7ce5SGreg Kroah-Hartman * same time, as interrupts might otherwise get the wrong pointers. 164496fd7ce5SGreg Kroah-Hartman * 164596fd7ce5SGreg Kroah-Hartman * WSH 09/09/97: rewritten to avoid some nasty race conditions that could 164696fd7ce5SGreg Kroah-Hartman * lead to double frees or releasing memory still in use. 164796fd7ce5SGreg Kroah-Hartman */ 164896fd7ce5SGreg Kroah-Hartman 164996fd7ce5SGreg Kroah-Hartman int tty_release(struct inode *inode, struct file *filp) 165096fd7ce5SGreg Kroah-Hartman { 165196fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(filp); 16527ffb6da9SPeter Hurley struct tty_struct *o_tty = NULL; 16537ffb6da9SPeter Hurley int do_sleep, final; 165496fd7ce5SGreg Kroah-Hartman int idx; 165537b16457SPeter Hurley long timeout = 0; 1656494c1eacSPeter Hurley int once = 1; 165796fd7ce5SGreg Kroah-Hartman 16589de44bd6SJiri Slaby if (tty_paranoia_check(tty, inode, __func__)) 165996fd7ce5SGreg Kroah-Hartman return 0; 166096fd7ce5SGreg Kroah-Hartman 166189c8d91eSAlan Cox tty_lock(tty); 16629de44bd6SJiri Slaby check_tty_count(tty, __func__); 166396fd7ce5SGreg Kroah-Hartman 166496fd7ce5SGreg Kroah-Hartman __tty_fasync(-1, filp, 0); 166596fd7ce5SGreg Kroah-Hartman 166696fd7ce5SGreg Kroah-Hartman idx = tty->index; 16677ffb6da9SPeter Hurley if (tty->driver->type == TTY_DRIVER_TYPE_PTY && 16687ffb6da9SPeter Hurley tty->driver->subtype == PTY_TYPE_MASTER) 166996fd7ce5SGreg Kroah-Hartman o_tty = tty->link; 167096fd7ce5SGreg Kroah-Hartman 1671359b9fb5SPeter Hurley if (tty_release_checks(tty, idx)) { 167289c8d91eSAlan Cox tty_unlock(tty); 167396fd7ce5SGreg Kroah-Hartman return 0; 167496fd7ce5SGreg Kroah-Hartman } 167596fd7ce5SGreg Kroah-Hartman 1676d435cefeSPeter Hurley tty_debug_hangup(tty, "releasing (count=%d)\n", tty->count); 167796fd7ce5SGreg Kroah-Hartman 167896fd7ce5SGreg Kroah-Hartman if (tty->ops->close) 167996fd7ce5SGreg Kroah-Hartman tty->ops->close(tty, filp); 168096fd7ce5SGreg Kroah-Hartman 16812aff5e2bSPeter Hurley /* If tty is pty master, lock the slave pty (stable lock order) */ 16822aff5e2bSPeter Hurley tty_lock_slave(o_tty); 16832aff5e2bSPeter Hurley 168496fd7ce5SGreg Kroah-Hartman /* 168596fd7ce5SGreg Kroah-Hartman * Sanity check: if tty->count is going to zero, there shouldn't be 168696fd7ce5SGreg Kroah-Hartman * any waiters on tty->read_wait or tty->write_wait. We test the 168796fd7ce5SGreg Kroah-Hartman * wait queues and kick everyone out _before_ actually starting to 168896fd7ce5SGreg Kroah-Hartman * close. This ensures that we won't block while releasing the tty 168996fd7ce5SGreg Kroah-Hartman * structure. 169096fd7ce5SGreg Kroah-Hartman * 169196fd7ce5SGreg Kroah-Hartman * The test for the o_tty closing is necessary, since the master and 169296fd7ce5SGreg Kroah-Hartman * slave sides may close in any order. If the slave side closes out 169396fd7ce5SGreg Kroah-Hartman * first, its count will be one, since the master side holds an open. 1694324c1650SPeter Hurley * Thus this test wouldn't be triggered at the time the slave closed, 169596fd7ce5SGreg Kroah-Hartman * so we do it now. 169696fd7ce5SGreg Kroah-Hartman */ 1697d5e370a4SPeter Hurley while (1) { 169896fd7ce5SGreg Kroah-Hartman do_sleep = 0; 169996fd7ce5SGreg Kroah-Hartman 1700324c1650SPeter Hurley if (tty->count <= 1) { 170196fd7ce5SGreg Kroah-Hartman if (waitqueue_active(&tty->read_wait)) { 1702a9a08845SLinus Torvalds wake_up_poll(&tty->read_wait, EPOLLIN); 170396fd7ce5SGreg Kroah-Hartman do_sleep++; 170496fd7ce5SGreg Kroah-Hartman } 170596fd7ce5SGreg Kroah-Hartman if (waitqueue_active(&tty->write_wait)) { 1706a9a08845SLinus Torvalds wake_up_poll(&tty->write_wait, EPOLLOUT); 170796fd7ce5SGreg Kroah-Hartman do_sleep++; 170896fd7ce5SGreg Kroah-Hartman } 170996fd7ce5SGreg Kroah-Hartman } 17107ffb6da9SPeter Hurley if (o_tty && o_tty->count <= 1) { 171196fd7ce5SGreg Kroah-Hartman if (waitqueue_active(&o_tty->read_wait)) { 1712a9a08845SLinus Torvalds wake_up_poll(&o_tty->read_wait, EPOLLIN); 171396fd7ce5SGreg Kroah-Hartman do_sleep++; 171496fd7ce5SGreg Kroah-Hartman } 171596fd7ce5SGreg Kroah-Hartman if (waitqueue_active(&o_tty->write_wait)) { 1716a9a08845SLinus Torvalds wake_up_poll(&o_tty->write_wait, EPOLLOUT); 171796fd7ce5SGreg Kroah-Hartman do_sleep++; 171896fd7ce5SGreg Kroah-Hartman } 171996fd7ce5SGreg Kroah-Hartman } 172096fd7ce5SGreg Kroah-Hartman if (!do_sleep) 172196fd7ce5SGreg Kroah-Hartman break; 172296fd7ce5SGreg Kroah-Hartman 1723494c1eacSPeter Hurley if (once) { 1724494c1eacSPeter Hurley once = 0; 1725339f36baSPeter Hurley tty_warn(tty, "read/write wait queue active!\n"); 1726494c1eacSPeter Hurley } 172737b16457SPeter Hurley schedule_timeout_killable(timeout); 172837b16457SPeter Hurley if (timeout < 120 * HZ) 172937b16457SPeter Hurley timeout = 2 * timeout + 1; 173037b16457SPeter Hurley else 173137b16457SPeter Hurley timeout = MAX_SCHEDULE_TIMEOUT; 173296fd7ce5SGreg Kroah-Hartman } 173396fd7ce5SGreg Kroah-Hartman 17347ffb6da9SPeter Hurley if (o_tty) { 173596fd7ce5SGreg Kroah-Hartman if (--o_tty->count < 0) { 1736339f36baSPeter Hurley tty_warn(tty, "bad slave count (%d)\n", o_tty->count); 173796fd7ce5SGreg Kroah-Hartman o_tty->count = 0; 173896fd7ce5SGreg Kroah-Hartman } 173996fd7ce5SGreg Kroah-Hartman } 174096fd7ce5SGreg Kroah-Hartman if (--tty->count < 0) { 1741339f36baSPeter Hurley tty_warn(tty, "bad tty->count (%d)\n", tty->count); 174296fd7ce5SGreg Kroah-Hartman tty->count = 0; 174396fd7ce5SGreg Kroah-Hartman } 174496fd7ce5SGreg Kroah-Hartman 174596fd7ce5SGreg Kroah-Hartman /* 174696fd7ce5SGreg Kroah-Hartman * We've decremented tty->count, so we need to remove this file 174796fd7ce5SGreg Kroah-Hartman * descriptor off the tty->tty_files list; this serves two 174896fd7ce5SGreg Kroah-Hartman * purposes: 174996fd7ce5SGreg Kroah-Hartman * - check_tty_count sees the correct number of file descriptors 175096fd7ce5SGreg Kroah-Hartman * associated with this tty. 175196fd7ce5SGreg Kroah-Hartman * - do_tty_hangup no longer sees this file descriptor as 175296fd7ce5SGreg Kroah-Hartman * something that needs to be handled for hangups. 175396fd7ce5SGreg Kroah-Hartman */ 175496fd7ce5SGreg Kroah-Hartman tty_del_file(filp); 175596fd7ce5SGreg Kroah-Hartman 175696fd7ce5SGreg Kroah-Hartman /* 175796fd7ce5SGreg Kroah-Hartman * Perform some housekeeping before deciding whether to return. 175896fd7ce5SGreg Kroah-Hartman * 175996fd7ce5SGreg Kroah-Hartman * If _either_ side is closing, make sure there aren't any 176096fd7ce5SGreg Kroah-Hartman * processes that still think tty or o_tty is their controlling 176196fd7ce5SGreg Kroah-Hartman * tty. 176296fd7ce5SGreg Kroah-Hartman */ 1763324c1650SPeter Hurley if (!tty->count) { 176496fd7ce5SGreg Kroah-Hartman read_lock(&tasklist_lock); 176596fd7ce5SGreg Kroah-Hartman session_clear_tty(tty->session); 17667ffb6da9SPeter Hurley if (o_tty) 176796fd7ce5SGreg Kroah-Hartman session_clear_tty(o_tty->session); 176896fd7ce5SGreg Kroah-Hartman read_unlock(&tasklist_lock); 176996fd7ce5SGreg Kroah-Hartman } 177096fd7ce5SGreg Kroah-Hartman 1771324c1650SPeter Hurley /* check whether both sides are closing ... */ 17727ffb6da9SPeter Hurley final = !tty->count && !(o_tty && o_tty->count); 1773324c1650SPeter Hurley 17742aff5e2bSPeter Hurley tty_unlock_slave(o_tty); 17752aff5e2bSPeter Hurley tty_unlock(tty); 17762aff5e2bSPeter Hurley 177704980706SPeter Hurley /* At this point, the tty->count == 0 should ensure a dead tty 1778d155255aSAlan Cox cannot be re-opened by a racing opener */ 177996fd7ce5SGreg Kroah-Hartman 1780324c1650SPeter Hurley if (!final) 178196fd7ce5SGreg Kroah-Hartman return 0; 178296fd7ce5SGreg Kroah-Hartman 1783accff793SPeter Hurley tty_debug_hangup(tty, "final close\n"); 1784a2965b7bSPeter Hurley 17859ed90d20SRob Herring tty_release_struct(tty, idx); 178696fd7ce5SGreg Kroah-Hartman return 0; 178796fd7ce5SGreg Kroah-Hartman } 178896fd7ce5SGreg Kroah-Hartman 178996fd7ce5SGreg Kroah-Hartman /** 179052494eebSPeter Hurley * tty_open_current_tty - get locked tty of current task 1791b82154acSJiri Slaby * @device: device number 1792b82154acSJiri Slaby * @filp: file pointer to tty 179352494eebSPeter Hurley * @return: locked tty of the current task iff @device is /dev/tty 179452494eebSPeter Hurley * 179552494eebSPeter Hurley * Performs a re-open of the current task's controlling tty. 1796b82154acSJiri Slaby * 1797b82154acSJiri Slaby * We cannot return driver and index like for the other nodes because 1798b82154acSJiri Slaby * devpts will not work then. It expects inodes to be from devpts FS. 1799b82154acSJiri Slaby */ 1800b82154acSJiri Slaby static struct tty_struct *tty_open_current_tty(dev_t device, struct file *filp) 1801b82154acSJiri Slaby { 1802b82154acSJiri Slaby struct tty_struct *tty; 180352494eebSPeter Hurley int retval; 1804b82154acSJiri Slaby 1805b82154acSJiri Slaby if (device != MKDEV(TTYAUX_MAJOR, 0)) 1806b82154acSJiri Slaby return NULL; 1807b82154acSJiri Slaby 1808b82154acSJiri Slaby tty = get_current_tty(); 1809b82154acSJiri Slaby if (!tty) 1810b82154acSJiri Slaby return ERR_PTR(-ENXIO); 1811b82154acSJiri Slaby 1812b82154acSJiri Slaby filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */ 1813b82154acSJiri Slaby /* noctty = 1; */ 181452494eebSPeter Hurley tty_lock(tty); 181552494eebSPeter Hurley tty_kref_put(tty); /* safe to drop the kref now */ 181652494eebSPeter Hurley 181752494eebSPeter Hurley retval = tty_reopen(tty); 181852494eebSPeter Hurley if (retval < 0) { 181952494eebSPeter Hurley tty_unlock(tty); 182052494eebSPeter Hurley tty = ERR_PTR(retval); 182152494eebSPeter Hurley } 1822b82154acSJiri Slaby return tty; 1823b82154acSJiri Slaby } 1824b82154acSJiri Slaby 1825b82154acSJiri Slaby /** 18265b5e7040SJiri Slaby * tty_lookup_driver - lookup a tty driver for a given device file 18275b5e7040SJiri Slaby * @device: device number 18285b5e7040SJiri Slaby * @filp: file pointer to tty 18295b5e7040SJiri Slaby * @index: index for the device in the @return driver 18305b5e7040SJiri Slaby * @return: driver for this inode (with increased refcount) 18315b5e7040SJiri Slaby * 18325b5e7040SJiri Slaby * If @return is not erroneous, the caller is responsible to decrement the 18335b5e7040SJiri Slaby * refcount by tty_driver_kref_put. 18345b5e7040SJiri Slaby * 18355b5e7040SJiri Slaby * Locking: tty_mutex protects get_tty_driver 18365b5e7040SJiri Slaby */ 18375b5e7040SJiri Slaby static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, 183811e1d4aaSPeter Hurley int *index) 18395b5e7040SJiri Slaby { 18408c8af41dSLin Yi struct tty_driver *driver = NULL; 18415b5e7040SJiri Slaby 18422cd0050cSJiri Slaby switch (device) { 18435b5e7040SJiri Slaby #ifdef CONFIG_VT 18442cd0050cSJiri Slaby case MKDEV(TTY_MAJOR, 0): { 18455b5e7040SJiri Slaby extern struct tty_driver *console_driver; 18465b5e7040SJiri Slaby driver = tty_driver_kref_get(console_driver); 18475b5e7040SJiri Slaby *index = fg_console; 18482cd0050cSJiri Slaby break; 18495b5e7040SJiri Slaby } 18505b5e7040SJiri Slaby #endif 18512cd0050cSJiri Slaby case MKDEV(TTYAUX_MAJOR, 1): { 18525b5e7040SJiri Slaby struct tty_driver *console_driver = console_device(index); 18535b5e7040SJiri Slaby if (console_driver) { 18545b5e7040SJiri Slaby driver = tty_driver_kref_get(console_driver); 185512e84c71SOkash Khawaja if (driver && filp) { 18565b5e7040SJiri Slaby /* Don't let /dev/console block */ 18575b5e7040SJiri Slaby filp->f_flags |= O_NONBLOCK; 18582cd0050cSJiri Slaby break; 18595b5e7040SJiri Slaby } 18605b5e7040SJiri Slaby } 18618c8af41dSLin Yi if (driver) 18628c8af41dSLin Yi tty_driver_kref_put(driver); 18635b5e7040SJiri Slaby return ERR_PTR(-ENODEV); 18645b5e7040SJiri Slaby } 18652cd0050cSJiri Slaby default: 18665b5e7040SJiri Slaby driver = get_tty_driver(device, index); 18675b5e7040SJiri Slaby if (!driver) 18685b5e7040SJiri Slaby return ERR_PTR(-ENODEV); 18692cd0050cSJiri Slaby break; 18702cd0050cSJiri Slaby } 18715b5e7040SJiri Slaby return driver; 18725b5e7040SJiri Slaby } 18735b5e7040SJiri Slaby 18745b5e7040SJiri Slaby /** 1875a09ac397SOkash Khawaja * tty_kopen - open a tty device for kernel 1876a09ac397SOkash Khawaja * @device: dev_t of device to open 1877a09ac397SOkash Khawaja * 1878a09ac397SOkash Khawaja * Opens tty exclusively for kernel. Performs the driver lookup, 1879a09ac397SOkash Khawaja * makes sure it's not already opened and performs the first-time 1880a09ac397SOkash Khawaja * tty initialization. 1881a09ac397SOkash Khawaja * 1882a09ac397SOkash Khawaja * Returns the locked initialized &tty_struct 1883a09ac397SOkash Khawaja * 1884a09ac397SOkash Khawaja * Claims the global tty_mutex to serialize: 1885a09ac397SOkash Khawaja * - concurrent first-time tty initialization 1886a09ac397SOkash Khawaja * - concurrent tty driver removal w/ lookup 1887a09ac397SOkash Khawaja * - concurrent tty removal from driver table 1888a09ac397SOkash Khawaja */ 1889a09ac397SOkash Khawaja struct tty_struct *tty_kopen(dev_t device) 1890a09ac397SOkash Khawaja { 1891a09ac397SOkash Khawaja struct tty_struct *tty; 1892a09ac397SOkash Khawaja struct tty_driver *driver = NULL; 1893a09ac397SOkash Khawaja int index = -1; 1894a09ac397SOkash Khawaja 1895a09ac397SOkash Khawaja mutex_lock(&tty_mutex); 1896a09ac397SOkash Khawaja driver = tty_lookup_driver(device, NULL, &index); 1897a09ac397SOkash Khawaja if (IS_ERR(driver)) { 1898a09ac397SOkash Khawaja mutex_unlock(&tty_mutex); 1899a09ac397SOkash Khawaja return ERR_CAST(driver); 1900a09ac397SOkash Khawaja } 1901a09ac397SOkash Khawaja 1902a09ac397SOkash Khawaja /* check whether we're reopening an existing tty */ 1903a09ac397SOkash Khawaja tty = tty_driver_lookup_tty(driver, NULL, index); 1904a09ac397SOkash Khawaja if (IS_ERR(tty)) 1905a09ac397SOkash Khawaja goto out; 1906a09ac397SOkash Khawaja 1907a09ac397SOkash Khawaja if (tty) { 1908a09ac397SOkash Khawaja /* drop kref from tty_driver_lookup_tty() */ 1909a09ac397SOkash Khawaja tty_kref_put(tty); 1910a09ac397SOkash Khawaja tty = ERR_PTR(-EBUSY); 1911a09ac397SOkash Khawaja } else { /* tty_init_dev returns tty with the tty_lock held */ 1912a09ac397SOkash Khawaja tty = tty_init_dev(driver, index); 1913a09ac397SOkash Khawaja if (IS_ERR(tty)) 1914a09ac397SOkash Khawaja goto out; 1915a09ac397SOkash Khawaja tty_port_set_kopened(tty->port, 1); 1916a09ac397SOkash Khawaja } 1917a09ac397SOkash Khawaja out: 1918a09ac397SOkash Khawaja mutex_unlock(&tty_mutex); 1919a09ac397SOkash Khawaja tty_driver_kref_put(driver); 1920a09ac397SOkash Khawaja return tty; 1921a09ac397SOkash Khawaja } 1922a09ac397SOkash Khawaja EXPORT_SYMBOL_GPL(tty_kopen); 1923a09ac397SOkash Khawaja 1924a09ac397SOkash Khawaja /** 1925d6203d0cSPeter Hurley * tty_open_by_driver - open a tty device 1926d6203d0cSPeter Hurley * @device: dev_t of device to open 1927d6203d0cSPeter Hurley * @filp: file pointer to tty 1928d6203d0cSPeter Hurley * 1929d6203d0cSPeter Hurley * Performs the driver lookup, checks for a reopen, or otherwise 1930d6203d0cSPeter Hurley * performs the first-time tty initialization. 1931d6203d0cSPeter Hurley * 1932d6203d0cSPeter Hurley * Returns the locked initialized or re-opened &tty_struct 1933d6203d0cSPeter Hurley * 1934d6203d0cSPeter Hurley * Claims the global tty_mutex to serialize: 1935d6203d0cSPeter Hurley * - concurrent first-time tty initialization 1936d6203d0cSPeter Hurley * - concurrent tty driver removal w/ lookup 1937d6203d0cSPeter Hurley * - concurrent tty removal from driver table 1938d6203d0cSPeter Hurley */ 193914ce3848SSudip Mukherjee static struct tty_struct *tty_open_by_driver(dev_t device, 1940d6203d0cSPeter Hurley struct file *filp) 1941d6203d0cSPeter Hurley { 1942d6203d0cSPeter Hurley struct tty_struct *tty; 1943d6203d0cSPeter Hurley struct tty_driver *driver = NULL; 1944d6203d0cSPeter Hurley int index = -1; 1945d6203d0cSPeter Hurley int retval; 1946d6203d0cSPeter Hurley 1947d6203d0cSPeter Hurley mutex_lock(&tty_mutex); 1948d6203d0cSPeter Hurley driver = tty_lookup_driver(device, filp, &index); 1949d6203d0cSPeter Hurley if (IS_ERR(driver)) { 1950d6203d0cSPeter Hurley mutex_unlock(&tty_mutex); 1951d6203d0cSPeter Hurley return ERR_CAST(driver); 1952d6203d0cSPeter Hurley } 1953d6203d0cSPeter Hurley 1954d6203d0cSPeter Hurley /* check whether we're reopening an existing tty */ 19558ead9dd5SLinus Torvalds tty = tty_driver_lookup_tty(driver, filp, index); 1956d6203d0cSPeter Hurley if (IS_ERR(tty)) { 1957d6203d0cSPeter Hurley mutex_unlock(&tty_mutex); 1958d6203d0cSPeter Hurley goto out; 1959d6203d0cSPeter Hurley } 1960d6203d0cSPeter Hurley 1961d6203d0cSPeter Hurley if (tty) { 1962a09ac397SOkash Khawaja if (tty_port_kopened(tty->port)) { 1963a09ac397SOkash Khawaja tty_kref_put(tty); 1964a09ac397SOkash Khawaja mutex_unlock(&tty_mutex); 1965a09ac397SOkash Khawaja tty = ERR_PTR(-EBUSY); 1966a09ac397SOkash Khawaja goto out; 1967a09ac397SOkash Khawaja } 1968d6203d0cSPeter Hurley mutex_unlock(&tty_mutex); 1969d6203d0cSPeter Hurley retval = tty_lock_interruptible(tty); 19705e00bbfbSPeter Hurley tty_kref_put(tty); /* drop kref from tty_driver_lookup_tty() */ 1971d6203d0cSPeter Hurley if (retval) { 1972d6203d0cSPeter Hurley if (retval == -EINTR) 1973d6203d0cSPeter Hurley retval = -ERESTARTSYS; 1974d6203d0cSPeter Hurley tty = ERR_PTR(retval); 1975d6203d0cSPeter Hurley goto out; 1976d6203d0cSPeter Hurley } 1977d6203d0cSPeter Hurley retval = tty_reopen(tty); 1978d6203d0cSPeter Hurley if (retval < 0) { 1979d6203d0cSPeter Hurley tty_unlock(tty); 1980d6203d0cSPeter Hurley tty = ERR_PTR(retval); 1981d6203d0cSPeter Hurley } 1982d6203d0cSPeter Hurley } else { /* Returns with the tty_lock held for now */ 1983d6203d0cSPeter Hurley tty = tty_init_dev(driver, index); 1984d6203d0cSPeter Hurley mutex_unlock(&tty_mutex); 1985d6203d0cSPeter Hurley } 1986d6203d0cSPeter Hurley out: 1987d6203d0cSPeter Hurley tty_driver_kref_put(driver); 1988d6203d0cSPeter Hurley return tty; 1989d6203d0cSPeter Hurley } 1990d6203d0cSPeter Hurley 1991d6203d0cSPeter Hurley /** 199296fd7ce5SGreg Kroah-Hartman * tty_open - open a tty device 199396fd7ce5SGreg Kroah-Hartman * @inode: inode of device file 199496fd7ce5SGreg Kroah-Hartman * @filp: file pointer to tty 199596fd7ce5SGreg Kroah-Hartman * 199696fd7ce5SGreg Kroah-Hartman * tty_open and tty_release keep up the tty count that contains the 199796fd7ce5SGreg Kroah-Hartman * number of opens done on a tty. We cannot use the inode-count, as 199896fd7ce5SGreg Kroah-Hartman * different inodes might point to the same tty. 199996fd7ce5SGreg Kroah-Hartman * 200096fd7ce5SGreg Kroah-Hartman * Open-counting is needed for pty masters, as well as for keeping 200196fd7ce5SGreg Kroah-Hartman * track of serial lines: DTR is dropped when the last close happens. 200296fd7ce5SGreg Kroah-Hartman * (This is not done solely through tty->count, now. - Ted 1/27/92) 200396fd7ce5SGreg Kroah-Hartman * 200496fd7ce5SGreg Kroah-Hartman * The termios state of a pty is reset on first open so that 200596fd7ce5SGreg Kroah-Hartman * settings don't persist across reuse. 200696fd7ce5SGreg Kroah-Hartman * 20075b5e7040SJiri Slaby * Locking: tty_mutex protects tty, tty_lookup_driver and tty_init_dev. 200896fd7ce5SGreg Kroah-Hartman * tty->count should protect the rest. 200996fd7ce5SGreg Kroah-Hartman * ->siglock protects ->signal/->sighand 201089c8d91eSAlan Cox * 201189c8d91eSAlan Cox * Note: the tty_unlock/lock cases without a ref are only safe due to 201289c8d91eSAlan Cox * tty_mutex 201396fd7ce5SGreg Kroah-Hartman */ 201496fd7ce5SGreg Kroah-Hartman 201596fd7ce5SGreg Kroah-Hartman static int tty_open(struct inode *inode, struct file *filp) 201696fd7ce5SGreg Kroah-Hartman { 2017b82154acSJiri Slaby struct tty_struct *tty; 201896fd7ce5SGreg Kroah-Hartman int noctty, retval; 201996fd7ce5SGreg Kroah-Hartman dev_t device = inode->i_rdev; 202096fd7ce5SGreg Kroah-Hartman unsigned saved_flags = filp->f_flags; 202196fd7ce5SGreg Kroah-Hartman 202296fd7ce5SGreg Kroah-Hartman nonseekable_open(inode, filp); 202396fd7ce5SGreg Kroah-Hartman 202496fd7ce5SGreg Kroah-Hartman retry_open: 2025fa90e1c9SJiri Slaby retval = tty_alloc_file(filp); 2026fa90e1c9SJiri Slaby if (retval) 2027fa90e1c9SJiri Slaby return -ENOMEM; 2028fa90e1c9SJiri Slaby 2029b82154acSJiri Slaby tty = tty_open_current_tty(device, filp); 2030d6203d0cSPeter Hurley if (!tty) 203114ce3848SSudip Mukherjee tty = tty_open_by_driver(device, filp); 203252494eebSPeter Hurley 203396fd7ce5SGreg Kroah-Hartman if (IS_ERR(tty)) { 2034d6203d0cSPeter Hurley tty_free_file(filp); 2035ba5db448SJiri Slaby retval = PTR_ERR(tty); 20367f22f6c9SPeter Hurley if (retval != -EAGAIN || signal_pending(current)) 2037d6203d0cSPeter Hurley return retval; 20387f22f6c9SPeter Hurley schedule(); 20397f22f6c9SPeter Hurley goto retry_open; 204096fd7ce5SGreg Kroah-Hartman } 204196fd7ce5SGreg Kroah-Hartman 2042fa90e1c9SJiri Slaby tty_add_file(tty, filp); 204396fd7ce5SGreg Kroah-Hartman 20449de44bd6SJiri Slaby check_tty_count(tty, __func__); 2045d435cefeSPeter Hurley tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); 2046accff793SPeter Hurley 204796fd7ce5SGreg Kroah-Hartman if (tty->ops->open) 204896fd7ce5SGreg Kroah-Hartman retval = tty->ops->open(tty, filp); 204996fd7ce5SGreg Kroah-Hartman else 205096fd7ce5SGreg Kroah-Hartman retval = -ENODEV; 205196fd7ce5SGreg Kroah-Hartman filp->f_flags = saved_flags; 205296fd7ce5SGreg Kroah-Hartman 205396fd7ce5SGreg Kroah-Hartman if (retval) { 2054d435cefeSPeter Hurley tty_debug_hangup(tty, "open error %d, releasing\n", retval); 2055accff793SPeter Hurley 205689c8d91eSAlan Cox tty_unlock(tty); /* need to call tty_release without BTM */ 205796fd7ce5SGreg Kroah-Hartman tty_release(inode, filp); 205896fd7ce5SGreg Kroah-Hartman if (retval != -ERESTARTSYS) 205996fd7ce5SGreg Kroah-Hartman return retval; 206096fd7ce5SGreg Kroah-Hartman 206196fd7ce5SGreg Kroah-Hartman if (signal_pending(current)) 206296fd7ce5SGreg Kroah-Hartman return retval; 206396fd7ce5SGreg Kroah-Hartman 206496fd7ce5SGreg Kroah-Hartman schedule(); 206596fd7ce5SGreg Kroah-Hartman /* 206696fd7ce5SGreg Kroah-Hartman * Need to reset f_op in case a hangup happened. 206796fd7ce5SGreg Kroah-Hartman */ 20681256937fSPeter Hurley if (tty_hung_up_p(filp)) 206996fd7ce5SGreg Kroah-Hartman filp->f_op = &tty_fops; 207096fd7ce5SGreg Kroah-Hartman goto retry_open; 207196fd7ce5SGreg Kroah-Hartman } 2072d4855e1fSPeter Hurley clear_bit(TTY_HUPPED, &tty->flags); 207396fd7ce5SGreg Kroah-Hartman 207411e1d4aaSPeter Hurley noctty = (filp->f_flags & O_NOCTTY) || 2075da5a0fc6SPeter Hurley (IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) || 207611e1d4aaSPeter Hurley device == MKDEV(TTYAUX_MAJOR, 1) || 207711e1d4aaSPeter Hurley (tty->driver->type == TTY_DRIVER_TYPE_PTY && 207811e1d4aaSPeter Hurley tty->driver->subtype == PTY_TYPE_MASTER); 2079a1235b3eSNicolas Pitre if (!noctty) 2080a1235b3eSNicolas Pitre tty_open_proc_set_tty(filp, tty); 208189c8d91eSAlan Cox tty_unlock(tty); 208296fd7ce5SGreg Kroah-Hartman return 0; 208396fd7ce5SGreg Kroah-Hartman } 208496fd7ce5SGreg Kroah-Hartman 208596fd7ce5SGreg Kroah-Hartman 208696fd7ce5SGreg Kroah-Hartman 208796fd7ce5SGreg Kroah-Hartman /** 208896fd7ce5SGreg Kroah-Hartman * tty_poll - check tty status 208996fd7ce5SGreg Kroah-Hartman * @filp: file being polled 209096fd7ce5SGreg Kroah-Hartman * @wait: poll wait structures to update 209196fd7ce5SGreg Kroah-Hartman * 209296fd7ce5SGreg Kroah-Hartman * Call the line discipline polling method to obtain the poll 209396fd7ce5SGreg Kroah-Hartman * status of the device. 209496fd7ce5SGreg Kroah-Hartman * 209596fd7ce5SGreg Kroah-Hartman * Locking: locks called line discipline but ldisc poll method 209696fd7ce5SGreg Kroah-Hartman * may be re-entered freely by other callers. 209796fd7ce5SGreg Kroah-Hartman */ 209896fd7ce5SGreg Kroah-Hartman 2099afc9a42bSAl Viro static __poll_t tty_poll(struct file *filp, poll_table *wait) 210096fd7ce5SGreg Kroah-Hartman { 210196fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(filp); 210296fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 2103e6c8adcaSAl Viro __poll_t ret = 0; 210496fd7ce5SGreg Kroah-Hartman 21056131ffaaSAl Viro if (tty_paranoia_check(tty, file_inode(filp), "tty_poll")) 210696fd7ce5SGreg Kroah-Hartman return 0; 210796fd7ce5SGreg Kroah-Hartman 210896fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 2109e55afd11SPeter Hurley if (!ld) 2110e55afd11SPeter Hurley return hung_up_tty_poll(filp, wait); 211196fd7ce5SGreg Kroah-Hartman if (ld->ops->poll) 2112c961bfb1SPeter Hurley ret = ld->ops->poll(tty, filp, wait); 211396fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 211496fd7ce5SGreg Kroah-Hartman return ret; 211596fd7ce5SGreg Kroah-Hartman } 211696fd7ce5SGreg Kroah-Hartman 211796fd7ce5SGreg Kroah-Hartman static int __tty_fasync(int fd, struct file *filp, int on) 211896fd7ce5SGreg Kroah-Hartman { 211996fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(filp); 212096fd7ce5SGreg Kroah-Hartman unsigned long flags; 212196fd7ce5SGreg Kroah-Hartman int retval = 0; 212296fd7ce5SGreg Kroah-Hartman 21236131ffaaSAl Viro if (tty_paranoia_check(tty, file_inode(filp), "tty_fasync")) 212496fd7ce5SGreg Kroah-Hartman goto out; 212596fd7ce5SGreg Kroah-Hartman 212696fd7ce5SGreg Kroah-Hartman retval = fasync_helper(fd, filp, on, &tty->fasync); 212796fd7ce5SGreg Kroah-Hartman if (retval <= 0) 212896fd7ce5SGreg Kroah-Hartman goto out; 212996fd7ce5SGreg Kroah-Hartman 213096fd7ce5SGreg Kroah-Hartman if (on) { 213196fd7ce5SGreg Kroah-Hartman enum pid_type type; 213296fd7ce5SGreg Kroah-Hartman struct pid *pid; 2133f6c8dbe6SPeter Hurley 213496fd7ce5SGreg Kroah-Hartman spin_lock_irqsave(&tty->ctrl_lock, flags); 213596fd7ce5SGreg Kroah-Hartman if (tty->pgrp) { 213696fd7ce5SGreg Kroah-Hartman pid = tty->pgrp; 213796fd7ce5SGreg Kroah-Hartman type = PIDTYPE_PGID; 213896fd7ce5SGreg Kroah-Hartman } else { 213996fd7ce5SGreg Kroah-Hartman pid = task_pid(current); 214001919134SEric W. Biederman type = PIDTYPE_TGID; 214196fd7ce5SGreg Kroah-Hartman } 214296fd7ce5SGreg Kroah-Hartman get_pid(pid); 214396fd7ce5SGreg Kroah-Hartman spin_unlock_irqrestore(&tty->ctrl_lock, flags); 2144e0b93eddSJeff Layton __f_setown(filp, pid, type, 0); 214596fd7ce5SGreg Kroah-Hartman put_pid(pid); 2146e0b93eddSJeff Layton retval = 0; 214796fd7ce5SGreg Kroah-Hartman } 214896fd7ce5SGreg Kroah-Hartman out: 214996fd7ce5SGreg Kroah-Hartman return retval; 215096fd7ce5SGreg Kroah-Hartman } 215196fd7ce5SGreg Kroah-Hartman 215296fd7ce5SGreg Kroah-Hartman static int tty_fasync(int fd, struct file *filp, int on) 215396fd7ce5SGreg Kroah-Hartman { 215489c8d91eSAlan Cox struct tty_struct *tty = file_tty(filp); 2155a8f3a297SPeter Hurley int retval = -ENOTTY; 215689c8d91eSAlan Cox 215789c8d91eSAlan Cox tty_lock(tty); 2158a8f3a297SPeter Hurley if (!tty_hung_up_p(filp)) 215996fd7ce5SGreg Kroah-Hartman retval = __tty_fasync(fd, filp, on); 216089c8d91eSAlan Cox tty_unlock(tty); 216189c8d91eSAlan Cox 216296fd7ce5SGreg Kroah-Hartman return retval; 216396fd7ce5SGreg Kroah-Hartman } 216496fd7ce5SGreg Kroah-Hartman 216596fd7ce5SGreg Kroah-Hartman /** 216696fd7ce5SGreg Kroah-Hartman * tiocsti - fake input character 216796fd7ce5SGreg Kroah-Hartman * @tty: tty to fake input into 216896fd7ce5SGreg Kroah-Hartman * @p: pointer to character 216996fd7ce5SGreg Kroah-Hartman * 217096fd7ce5SGreg Kroah-Hartman * Fake input to a tty device. Does the necessary locking and 217196fd7ce5SGreg Kroah-Hartman * input management. 217296fd7ce5SGreg Kroah-Hartman * 217396fd7ce5SGreg Kroah-Hartman * FIXME: does not honour flow control ?? 217496fd7ce5SGreg Kroah-Hartman * 217596fd7ce5SGreg Kroah-Hartman * Locking: 2176137084bbSPeter Hurley * Called functions take tty_ldiscs_lock 217796fd7ce5SGreg Kroah-Hartman * current->signal->tty check is safe without locks 217896fd7ce5SGreg Kroah-Hartman * 217996fd7ce5SGreg Kroah-Hartman * FIXME: may race normal receive processing 218096fd7ce5SGreg Kroah-Hartman */ 218196fd7ce5SGreg Kroah-Hartman 218296fd7ce5SGreg Kroah-Hartman static int tiocsti(struct tty_struct *tty, char __user *p) 218396fd7ce5SGreg Kroah-Hartman { 218496fd7ce5SGreg Kroah-Hartman char ch, mbz = 0; 218596fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 218696fd7ce5SGreg Kroah-Hartman 218796fd7ce5SGreg Kroah-Hartman if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN)) 218896fd7ce5SGreg Kroah-Hartman return -EPERM; 218996fd7ce5SGreg Kroah-Hartman if (get_user(ch, p)) 219096fd7ce5SGreg Kroah-Hartman return -EFAULT; 219196fd7ce5SGreg Kroah-Hartman tty_audit_tiocsti(tty, ch); 219296fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 2193e55afd11SPeter Hurley if (!ld) 2194e55afd11SPeter Hurley return -EIO; 219527cfb3a5SGreg Kroah-Hartman if (ld->ops->receive_buf) 219696fd7ce5SGreg Kroah-Hartman ld->ops->receive_buf(tty, &ch, &mbz, 1); 219796fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 219896fd7ce5SGreg Kroah-Hartman return 0; 219996fd7ce5SGreg Kroah-Hartman } 220096fd7ce5SGreg Kroah-Hartman 220196fd7ce5SGreg Kroah-Hartman /** 220296fd7ce5SGreg Kroah-Hartman * tiocgwinsz - implement window query ioctl 220396fd7ce5SGreg Kroah-Hartman * @tty; tty 220496fd7ce5SGreg Kroah-Hartman * @arg: user buffer for result 220596fd7ce5SGreg Kroah-Hartman * 220696fd7ce5SGreg Kroah-Hartman * Copies the kernel idea of the window size into the user buffer. 220796fd7ce5SGreg Kroah-Hartman * 2208dee4a0beSPeter Hurley * Locking: tty->winsize_mutex is taken to ensure the winsize data 220996fd7ce5SGreg Kroah-Hartman * is consistent. 221096fd7ce5SGreg Kroah-Hartman */ 221196fd7ce5SGreg Kroah-Hartman 221296fd7ce5SGreg Kroah-Hartman static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg) 221396fd7ce5SGreg Kroah-Hartman { 221496fd7ce5SGreg Kroah-Hartman int err; 221596fd7ce5SGreg Kroah-Hartman 2216dee4a0beSPeter Hurley mutex_lock(&tty->winsize_mutex); 221796fd7ce5SGreg Kroah-Hartman err = copy_to_user(arg, &tty->winsize, sizeof(*arg)); 2218dee4a0beSPeter Hurley mutex_unlock(&tty->winsize_mutex); 221996fd7ce5SGreg Kroah-Hartman 222096fd7ce5SGreg Kroah-Hartman return err ? -EFAULT: 0; 222196fd7ce5SGreg Kroah-Hartman } 222296fd7ce5SGreg Kroah-Hartman 222396fd7ce5SGreg Kroah-Hartman /** 222496fd7ce5SGreg Kroah-Hartman * tty_do_resize - resize event 222596fd7ce5SGreg Kroah-Hartman * @tty: tty being resized 222696fd7ce5SGreg Kroah-Hartman * @rows: rows (character) 222796fd7ce5SGreg Kroah-Hartman * @cols: cols (character) 222896fd7ce5SGreg Kroah-Hartman * 222996fd7ce5SGreg Kroah-Hartman * Update the termios variables and send the necessary signals to 223096fd7ce5SGreg Kroah-Hartman * peform a terminal resize correctly 223196fd7ce5SGreg Kroah-Hartman */ 223296fd7ce5SGreg Kroah-Hartman 223396fd7ce5SGreg Kroah-Hartman int tty_do_resize(struct tty_struct *tty, struct winsize *ws) 223496fd7ce5SGreg Kroah-Hartman { 223596fd7ce5SGreg Kroah-Hartman struct pid *pgrp; 223696fd7ce5SGreg Kroah-Hartman 223796fd7ce5SGreg Kroah-Hartman /* Lock the tty */ 2238dee4a0beSPeter Hurley mutex_lock(&tty->winsize_mutex); 223996fd7ce5SGreg Kroah-Hartman if (!memcmp(ws, &tty->winsize, sizeof(*ws))) 224096fd7ce5SGreg Kroah-Hartman goto done; 224196fd7ce5SGreg Kroah-Hartman 22425b239542SPeter Hurley /* Signal the foreground process group */ 22435b239542SPeter Hurley pgrp = tty_get_pgrp(tty); 224496fd7ce5SGreg Kroah-Hartman if (pgrp) 224596fd7ce5SGreg Kroah-Hartman kill_pgrp(pgrp, SIGWINCH, 1); 224696fd7ce5SGreg Kroah-Hartman put_pid(pgrp); 224796fd7ce5SGreg Kroah-Hartman 224896fd7ce5SGreg Kroah-Hartman tty->winsize = *ws; 224996fd7ce5SGreg Kroah-Hartman done: 2250dee4a0beSPeter Hurley mutex_unlock(&tty->winsize_mutex); 225196fd7ce5SGreg Kroah-Hartman return 0; 225296fd7ce5SGreg Kroah-Hartman } 22534d334fd1SMartin Schwidefsky EXPORT_SYMBOL(tty_do_resize); 225496fd7ce5SGreg Kroah-Hartman 225596fd7ce5SGreg Kroah-Hartman /** 225696fd7ce5SGreg Kroah-Hartman * tiocswinsz - implement window size set ioctl 225796fd7ce5SGreg Kroah-Hartman * @tty; tty side of tty 225896fd7ce5SGreg Kroah-Hartman * @arg: user buffer for result 225996fd7ce5SGreg Kroah-Hartman * 226096fd7ce5SGreg Kroah-Hartman * Copies the user idea of the window size to the kernel. Traditionally 226196fd7ce5SGreg Kroah-Hartman * this is just advisory information but for the Linux console it 226296fd7ce5SGreg Kroah-Hartman * actually has driver level meaning and triggers a VC resize. 226396fd7ce5SGreg Kroah-Hartman * 226496fd7ce5SGreg Kroah-Hartman * Locking: 226525985edcSLucas De Marchi * Driver dependent. The default do_resize method takes the 226696fd7ce5SGreg Kroah-Hartman * tty termios mutex and ctrl_lock. The console takes its own lock 226796fd7ce5SGreg Kroah-Hartman * then calls into the default method. 226896fd7ce5SGreg Kroah-Hartman */ 226996fd7ce5SGreg Kroah-Hartman 227096fd7ce5SGreg Kroah-Hartman static int tiocswinsz(struct tty_struct *tty, struct winsize __user *arg) 227196fd7ce5SGreg Kroah-Hartman { 227296fd7ce5SGreg Kroah-Hartman struct winsize tmp_ws; 227396fd7ce5SGreg Kroah-Hartman if (copy_from_user(&tmp_ws, arg, sizeof(*arg))) 227496fd7ce5SGreg Kroah-Hartman return -EFAULT; 227596fd7ce5SGreg Kroah-Hartman 227696fd7ce5SGreg Kroah-Hartman if (tty->ops->resize) 227796fd7ce5SGreg Kroah-Hartman return tty->ops->resize(tty, &tmp_ws); 227896fd7ce5SGreg Kroah-Hartman else 227996fd7ce5SGreg Kroah-Hartman return tty_do_resize(tty, &tmp_ws); 228096fd7ce5SGreg Kroah-Hartman } 228196fd7ce5SGreg Kroah-Hartman 228296fd7ce5SGreg Kroah-Hartman /** 228396fd7ce5SGreg Kroah-Hartman * tioccons - allow admin to move logical console 228496fd7ce5SGreg Kroah-Hartman * @file: the file to become console 228596fd7ce5SGreg Kroah-Hartman * 228625985edcSLucas De Marchi * Allow the administrator to move the redirected console device 228796fd7ce5SGreg Kroah-Hartman * 228896fd7ce5SGreg Kroah-Hartman * Locking: uses redirect_lock to guard the redirect information 228996fd7ce5SGreg Kroah-Hartman */ 229096fd7ce5SGreg Kroah-Hartman 229196fd7ce5SGreg Kroah-Hartman static int tioccons(struct file *file) 229296fd7ce5SGreg Kroah-Hartman { 229396fd7ce5SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 229496fd7ce5SGreg Kroah-Hartman return -EPERM; 229596fd7ce5SGreg Kroah-Hartman if (file->f_op->write == redirected_tty_write) { 229696fd7ce5SGreg Kroah-Hartman struct file *f; 229796fd7ce5SGreg Kroah-Hartman spin_lock(&redirect_lock); 229896fd7ce5SGreg Kroah-Hartman f = redirect; 229996fd7ce5SGreg Kroah-Hartman redirect = NULL; 230096fd7ce5SGreg Kroah-Hartman spin_unlock(&redirect_lock); 230196fd7ce5SGreg Kroah-Hartman if (f) 230296fd7ce5SGreg Kroah-Hartman fput(f); 230396fd7ce5SGreg Kroah-Hartman return 0; 230496fd7ce5SGreg Kroah-Hartman } 230596fd7ce5SGreg Kroah-Hartman spin_lock(&redirect_lock); 230696fd7ce5SGreg Kroah-Hartman if (redirect) { 230796fd7ce5SGreg Kroah-Hartman spin_unlock(&redirect_lock); 230896fd7ce5SGreg Kroah-Hartman return -EBUSY; 230996fd7ce5SGreg Kroah-Hartman } 2310cb0942b8SAl Viro redirect = get_file(file); 231196fd7ce5SGreg Kroah-Hartman spin_unlock(&redirect_lock); 231296fd7ce5SGreg Kroah-Hartman return 0; 231396fd7ce5SGreg Kroah-Hartman } 231496fd7ce5SGreg Kroah-Hartman 231596fd7ce5SGreg Kroah-Hartman /** 231696fd7ce5SGreg Kroah-Hartman * tiocsetd - set line discipline 231796fd7ce5SGreg Kroah-Hartman * @tty: tty device 231896fd7ce5SGreg Kroah-Hartman * @p: pointer to user data 231996fd7ce5SGreg Kroah-Hartman * 232096fd7ce5SGreg Kroah-Hartman * Set the line discipline according to user request. 232196fd7ce5SGreg Kroah-Hartman * 232296fd7ce5SGreg Kroah-Hartman * Locking: see tty_set_ldisc, this function is just a helper 232396fd7ce5SGreg Kroah-Hartman */ 232496fd7ce5SGreg Kroah-Hartman 232596fd7ce5SGreg Kroah-Hartman static int tiocsetd(struct tty_struct *tty, int __user *p) 232696fd7ce5SGreg Kroah-Hartman { 2327c12da96fSPeter Hurley int disc; 232896fd7ce5SGreg Kroah-Hartman int ret; 232996fd7ce5SGreg Kroah-Hartman 2330c12da96fSPeter Hurley if (get_user(disc, p)) 233196fd7ce5SGreg Kroah-Hartman return -EFAULT; 233296fd7ce5SGreg Kroah-Hartman 2333c12da96fSPeter Hurley ret = tty_set_ldisc(tty, disc); 233496fd7ce5SGreg Kroah-Hartman 233596fd7ce5SGreg Kroah-Hartman return ret; 233696fd7ce5SGreg Kroah-Hartman } 233796fd7ce5SGreg Kroah-Hartman 233896fd7ce5SGreg Kroah-Hartman /** 23395c17c861SPeter Hurley * tiocgetd - get line discipline 23405c17c861SPeter Hurley * @tty: tty device 23415c17c861SPeter Hurley * @p: pointer to user data 23425c17c861SPeter Hurley * 23435c17c861SPeter Hurley * Retrieves the line discipline id directly from the ldisc. 23445c17c861SPeter Hurley * 23455c17c861SPeter Hurley * Locking: waits for ldisc reference (in case the line discipline 23465c17c861SPeter Hurley * is changing or the tty is being hungup) 23475c17c861SPeter Hurley */ 23485c17c861SPeter Hurley 23495c17c861SPeter Hurley static int tiocgetd(struct tty_struct *tty, int __user *p) 23505c17c861SPeter Hurley { 23515c17c861SPeter Hurley struct tty_ldisc *ld; 23525c17c861SPeter Hurley int ret; 23535c17c861SPeter Hurley 23545c17c861SPeter Hurley ld = tty_ldisc_ref_wait(tty); 2355e55afd11SPeter Hurley if (!ld) 2356e55afd11SPeter Hurley return -EIO; 23575c17c861SPeter Hurley ret = put_user(ld->ops->num, p); 23585c17c861SPeter Hurley tty_ldisc_deref(ld); 23595c17c861SPeter Hurley return ret; 23605c17c861SPeter Hurley } 23615c17c861SPeter Hurley 23625c17c861SPeter Hurley /** 236396fd7ce5SGreg Kroah-Hartman * send_break - performed time break 236496fd7ce5SGreg Kroah-Hartman * @tty: device to break on 236596fd7ce5SGreg Kroah-Hartman * @duration: timeout in mS 236696fd7ce5SGreg Kroah-Hartman * 236796fd7ce5SGreg Kroah-Hartman * Perform a timed break on hardware that lacks its own driver level 236896fd7ce5SGreg Kroah-Hartman * timed break functionality. 236996fd7ce5SGreg Kroah-Hartman * 237096fd7ce5SGreg Kroah-Hartman * Locking: 237196fd7ce5SGreg Kroah-Hartman * atomic_write_lock serializes 237296fd7ce5SGreg Kroah-Hartman * 237396fd7ce5SGreg Kroah-Hartman */ 237496fd7ce5SGreg Kroah-Hartman 237596fd7ce5SGreg Kroah-Hartman static int send_break(struct tty_struct *tty, unsigned int duration) 237696fd7ce5SGreg Kroah-Hartman { 237796fd7ce5SGreg Kroah-Hartman int retval; 237896fd7ce5SGreg Kroah-Hartman 237996fd7ce5SGreg Kroah-Hartman if (tty->ops->break_ctl == NULL) 238096fd7ce5SGreg Kroah-Hartman return 0; 238196fd7ce5SGreg Kroah-Hartman 238296fd7ce5SGreg Kroah-Hartman if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK) 238396fd7ce5SGreg Kroah-Hartman retval = tty->ops->break_ctl(tty, duration); 238496fd7ce5SGreg Kroah-Hartman else { 238596fd7ce5SGreg Kroah-Hartman /* Do the work ourselves */ 238696fd7ce5SGreg Kroah-Hartman if (tty_write_lock(tty, 0) < 0) 238796fd7ce5SGreg Kroah-Hartman return -EINTR; 238896fd7ce5SGreg Kroah-Hartman retval = tty->ops->break_ctl(tty, -1); 238996fd7ce5SGreg Kroah-Hartman if (retval) 239096fd7ce5SGreg Kroah-Hartman goto out; 239196fd7ce5SGreg Kroah-Hartman if (!signal_pending(current)) 239296fd7ce5SGreg Kroah-Hartman msleep_interruptible(duration); 239396fd7ce5SGreg Kroah-Hartman retval = tty->ops->break_ctl(tty, 0); 239496fd7ce5SGreg Kroah-Hartman out: 239596fd7ce5SGreg Kroah-Hartman tty_write_unlock(tty); 239696fd7ce5SGreg Kroah-Hartman if (signal_pending(current)) 239796fd7ce5SGreg Kroah-Hartman retval = -EINTR; 239896fd7ce5SGreg Kroah-Hartman } 239996fd7ce5SGreg Kroah-Hartman return retval; 240096fd7ce5SGreg Kroah-Hartman } 240196fd7ce5SGreg Kroah-Hartman 240296fd7ce5SGreg Kroah-Hartman /** 240396fd7ce5SGreg Kroah-Hartman * tty_tiocmget - get modem status 240496fd7ce5SGreg Kroah-Hartman * @tty: tty device 240596fd7ce5SGreg Kroah-Hartman * @file: user file pointer 240696fd7ce5SGreg Kroah-Hartman * @p: pointer to result 240796fd7ce5SGreg Kroah-Hartman * 240896fd7ce5SGreg Kroah-Hartman * Obtain the modem status bits from the tty driver if the feature 240996fd7ce5SGreg Kroah-Hartman * is supported. Return -EINVAL if it is not available. 241096fd7ce5SGreg Kroah-Hartman * 241196fd7ce5SGreg Kroah-Hartman * Locking: none (up to the driver) 241296fd7ce5SGreg Kroah-Hartman */ 241396fd7ce5SGreg Kroah-Hartman 241460b33c13SAlan Cox static int tty_tiocmget(struct tty_struct *tty, int __user *p) 241596fd7ce5SGreg Kroah-Hartman { 241696fd7ce5SGreg Kroah-Hartman int retval = -EINVAL; 241796fd7ce5SGreg Kroah-Hartman 241896fd7ce5SGreg Kroah-Hartman if (tty->ops->tiocmget) { 241960b33c13SAlan Cox retval = tty->ops->tiocmget(tty); 242096fd7ce5SGreg Kroah-Hartman 242196fd7ce5SGreg Kroah-Hartman if (retval >= 0) 242296fd7ce5SGreg Kroah-Hartman retval = put_user(retval, p); 242396fd7ce5SGreg Kroah-Hartman } 242496fd7ce5SGreg Kroah-Hartman return retval; 242596fd7ce5SGreg Kroah-Hartman } 242696fd7ce5SGreg Kroah-Hartman 242796fd7ce5SGreg Kroah-Hartman /** 242896fd7ce5SGreg Kroah-Hartman * tty_tiocmset - set modem status 242996fd7ce5SGreg Kroah-Hartman * @tty: tty device 243096fd7ce5SGreg Kroah-Hartman * @cmd: command - clear bits, set bits or set all 243196fd7ce5SGreg Kroah-Hartman * @p: pointer to desired bits 243296fd7ce5SGreg Kroah-Hartman * 243396fd7ce5SGreg Kroah-Hartman * Set the modem status bits from the tty driver if the feature 243496fd7ce5SGreg Kroah-Hartman * is supported. Return -EINVAL if it is not available. 243596fd7ce5SGreg Kroah-Hartman * 243696fd7ce5SGreg Kroah-Hartman * Locking: none (up to the driver) 243796fd7ce5SGreg Kroah-Hartman */ 243896fd7ce5SGreg Kroah-Hartman 243920b9d177SAlan Cox static int tty_tiocmset(struct tty_struct *tty, unsigned int cmd, 244096fd7ce5SGreg Kroah-Hartman unsigned __user *p) 244196fd7ce5SGreg Kroah-Hartman { 244296fd7ce5SGreg Kroah-Hartman int retval; 244396fd7ce5SGreg Kroah-Hartman unsigned int set, clear, val; 244496fd7ce5SGreg Kroah-Hartman 244596fd7ce5SGreg Kroah-Hartman if (tty->ops->tiocmset == NULL) 244696fd7ce5SGreg Kroah-Hartman return -EINVAL; 244796fd7ce5SGreg Kroah-Hartman 244896fd7ce5SGreg Kroah-Hartman retval = get_user(val, p); 244996fd7ce5SGreg Kroah-Hartman if (retval) 245096fd7ce5SGreg Kroah-Hartman return retval; 245196fd7ce5SGreg Kroah-Hartman set = clear = 0; 245296fd7ce5SGreg Kroah-Hartman switch (cmd) { 245396fd7ce5SGreg Kroah-Hartman case TIOCMBIS: 245496fd7ce5SGreg Kroah-Hartman set = val; 245596fd7ce5SGreg Kroah-Hartman break; 245696fd7ce5SGreg Kroah-Hartman case TIOCMBIC: 245796fd7ce5SGreg Kroah-Hartman clear = val; 245896fd7ce5SGreg Kroah-Hartman break; 245996fd7ce5SGreg Kroah-Hartman case TIOCMSET: 246096fd7ce5SGreg Kroah-Hartman set = val; 246196fd7ce5SGreg Kroah-Hartman clear = ~val; 246296fd7ce5SGreg Kroah-Hartman break; 246396fd7ce5SGreg Kroah-Hartman } 246496fd7ce5SGreg Kroah-Hartman set &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP; 246596fd7ce5SGreg Kroah-Hartman clear &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP; 246620b9d177SAlan Cox return tty->ops->tiocmset(tty, set, clear); 246796fd7ce5SGreg Kroah-Hartman } 246896fd7ce5SGreg Kroah-Hartman 246996fd7ce5SGreg Kroah-Hartman static int tty_tiocgicount(struct tty_struct *tty, void __user *arg) 247096fd7ce5SGreg Kroah-Hartman { 247196fd7ce5SGreg Kroah-Hartman int retval = -EINVAL; 247296fd7ce5SGreg Kroah-Hartman struct serial_icounter_struct icount; 247396fd7ce5SGreg Kroah-Hartman memset(&icount, 0, sizeof(icount)); 247496fd7ce5SGreg Kroah-Hartman if (tty->ops->get_icount) 247596fd7ce5SGreg Kroah-Hartman retval = tty->ops->get_icount(tty, &icount); 247696fd7ce5SGreg Kroah-Hartman if (retval != 0) 247796fd7ce5SGreg Kroah-Hartman return retval; 247896fd7ce5SGreg Kroah-Hartman if (copy_to_user(arg, &icount, sizeof(icount))) 247996fd7ce5SGreg Kroah-Hartman return -EFAULT; 248096fd7ce5SGreg Kroah-Hartman return 0; 248196fd7ce5SGreg Kroah-Hartman } 248296fd7ce5SGreg Kroah-Hartman 24832f46a2c1SAl Viro static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss) 24848a8ae62fSJiri Slaby { 24858a8ae62fSJiri Slaby static DEFINE_RATELIMIT_STATE(depr_flags, 24868a8ae62fSJiri Slaby DEFAULT_RATELIMIT_INTERVAL, 24878a8ae62fSJiri Slaby DEFAULT_RATELIMIT_BURST); 24888a8ae62fSJiri Slaby char comm[TASK_COMM_LEN]; 24892f46a2c1SAl Viro struct serial_struct v; 24908a8ae62fSJiri Slaby int flags; 24918a8ae62fSJiri Slaby 24922f46a2c1SAl Viro if (copy_from_user(&v, ss, sizeof(struct serial_struct))) 24932f46a2c1SAl Viro return -EFAULT; 24948a8ae62fSJiri Slaby 24952f46a2c1SAl Viro flags = v.flags & ASYNC_DEPRECATED; 24968a8ae62fSJiri Slaby 24978a8ae62fSJiri Slaby if (flags && __ratelimit(&depr_flags)) 2498d437fa91SJoe Perches pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", 24998a8ae62fSJiri Slaby __func__, get_task_comm(comm, current), flags); 25002f46a2c1SAl Viro if (!tty->ops->set_serial) 2501930236a3SAl Viro return -ENOTTY; 25022f46a2c1SAl Viro return tty->ops->set_serial(tty, &v); 25032f46a2c1SAl Viro } 25042f46a2c1SAl Viro 25052f46a2c1SAl Viro static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss) 25062f46a2c1SAl Viro { 25072f46a2c1SAl Viro struct serial_struct v; 25082f46a2c1SAl Viro int err; 25092f46a2c1SAl Viro 25102f46a2c1SAl Viro memset(&v, 0, sizeof(struct serial_struct)); 25112f46a2c1SAl Viro if (!tty->ops->get_serial) 2512930236a3SAl Viro return -ENOTTY; 25132f46a2c1SAl Viro err = tty->ops->get_serial(tty, &v); 25142f46a2c1SAl Viro if (!err && copy_to_user(ss, &v, sizeof(struct serial_struct))) 25152f46a2c1SAl Viro err = -EFAULT; 25162f46a2c1SAl Viro return err; 25178a8ae62fSJiri Slaby } 25188a8ae62fSJiri Slaby 25198f166e00SPeter Hurley /* 25208f166e00SPeter Hurley * if pty, return the slave side (real_tty) 25218f166e00SPeter Hurley * otherwise, return self 25228f166e00SPeter Hurley */ 25238f166e00SPeter Hurley static struct tty_struct *tty_pair_get_tty(struct tty_struct *tty) 252496fd7ce5SGreg Kroah-Hartman { 252596fd7ce5SGreg Kroah-Hartman if (tty->driver->type == TTY_DRIVER_TYPE_PTY && 252696fd7ce5SGreg Kroah-Hartman tty->driver->subtype == PTY_TYPE_MASTER) 252796fd7ce5SGreg Kroah-Hartman tty = tty->link; 252896fd7ce5SGreg Kroah-Hartman return tty; 252996fd7ce5SGreg Kroah-Hartman } 253096fd7ce5SGreg Kroah-Hartman 253196fd7ce5SGreg Kroah-Hartman /* 253296fd7ce5SGreg Kroah-Hartman * Split this up, as gcc can choke on it otherwise.. 253396fd7ce5SGreg Kroah-Hartman */ 253496fd7ce5SGreg Kroah-Hartman long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 253596fd7ce5SGreg Kroah-Hartman { 253696fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(file); 253796fd7ce5SGreg Kroah-Hartman struct tty_struct *real_tty; 253896fd7ce5SGreg Kroah-Hartman void __user *p = (void __user *)arg; 253996fd7ce5SGreg Kroah-Hartman int retval; 254096fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 254196fd7ce5SGreg Kroah-Hartman 25426131ffaaSAl Viro if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl")) 254396fd7ce5SGreg Kroah-Hartman return -EINVAL; 254496fd7ce5SGreg Kroah-Hartman 254596fd7ce5SGreg Kroah-Hartman real_tty = tty_pair_get_tty(tty); 254696fd7ce5SGreg Kroah-Hartman 254796fd7ce5SGreg Kroah-Hartman /* 254896fd7ce5SGreg Kroah-Hartman * Factor out some common prep work 254996fd7ce5SGreg Kroah-Hartman */ 255096fd7ce5SGreg Kroah-Hartman switch (cmd) { 255196fd7ce5SGreg Kroah-Hartman case TIOCSETD: 255296fd7ce5SGreg Kroah-Hartman case TIOCSBRK: 255396fd7ce5SGreg Kroah-Hartman case TIOCCBRK: 255496fd7ce5SGreg Kroah-Hartman case TCSBRK: 255596fd7ce5SGreg Kroah-Hartman case TCSBRKP: 255696fd7ce5SGreg Kroah-Hartman retval = tty_check_change(tty); 255796fd7ce5SGreg Kroah-Hartman if (retval) 255896fd7ce5SGreg Kroah-Hartman return retval; 255996fd7ce5SGreg Kroah-Hartman if (cmd != TIOCCBRK) { 256096fd7ce5SGreg Kroah-Hartman tty_wait_until_sent(tty, 0); 256196fd7ce5SGreg Kroah-Hartman if (signal_pending(current)) 256296fd7ce5SGreg Kroah-Hartman return -EINTR; 256396fd7ce5SGreg Kroah-Hartman } 256496fd7ce5SGreg Kroah-Hartman break; 256596fd7ce5SGreg Kroah-Hartman } 256696fd7ce5SGreg Kroah-Hartman 256796fd7ce5SGreg Kroah-Hartman /* 256896fd7ce5SGreg Kroah-Hartman * Now do the stuff. 256996fd7ce5SGreg Kroah-Hartman */ 257096fd7ce5SGreg Kroah-Hartman switch (cmd) { 257196fd7ce5SGreg Kroah-Hartman case TIOCSTI: 257296fd7ce5SGreg Kroah-Hartman return tiocsti(tty, p); 257396fd7ce5SGreg Kroah-Hartman case TIOCGWINSZ: 257496fd7ce5SGreg Kroah-Hartman return tiocgwinsz(real_tty, p); 257596fd7ce5SGreg Kroah-Hartman case TIOCSWINSZ: 257696fd7ce5SGreg Kroah-Hartman return tiocswinsz(real_tty, p); 257796fd7ce5SGreg Kroah-Hartman case TIOCCONS: 257896fd7ce5SGreg Kroah-Hartman return real_tty != tty ? -EINVAL : tioccons(file); 257996fd7ce5SGreg Kroah-Hartman case TIOCEXCL: 258096fd7ce5SGreg Kroah-Hartman set_bit(TTY_EXCLUSIVE, &tty->flags); 258196fd7ce5SGreg Kroah-Hartman return 0; 258296fd7ce5SGreg Kroah-Hartman case TIOCNXCL: 258396fd7ce5SGreg Kroah-Hartman clear_bit(TTY_EXCLUSIVE, &tty->flags); 258496fd7ce5SGreg Kroah-Hartman return 0; 258584fd7bdfSCyrill Gorcunov case TIOCGEXCL: 258684fd7bdfSCyrill Gorcunov { 258784fd7bdfSCyrill Gorcunov int excl = test_bit(TTY_EXCLUSIVE, &tty->flags); 258884fd7bdfSCyrill Gorcunov return put_user(excl, (int __user *)p); 258984fd7bdfSCyrill Gorcunov } 259096fd7ce5SGreg Kroah-Hartman case TIOCGETD: 25915c17c861SPeter Hurley return tiocgetd(tty, p); 259296fd7ce5SGreg Kroah-Hartman case TIOCSETD: 259396fd7ce5SGreg Kroah-Hartman return tiocsetd(tty, p); 25943c95c985SKay Sievers case TIOCVHANGUP: 25953c95c985SKay Sievers if (!capable(CAP_SYS_ADMIN)) 25963c95c985SKay Sievers return -EPERM; 25973c95c985SKay Sievers tty_vhangup(tty); 25983c95c985SKay Sievers return 0; 2599b7b8de08SWerner Fink case TIOCGDEV: 2600b7b8de08SWerner Fink { 2601b7b8de08SWerner Fink unsigned int ret = new_encode_dev(tty_devnum(real_tty)); 2602b7b8de08SWerner Fink return put_user(ret, (unsigned int __user *)p); 2603b7b8de08SWerner Fink } 260496fd7ce5SGreg Kroah-Hartman /* 260596fd7ce5SGreg Kroah-Hartman * Break handling 260696fd7ce5SGreg Kroah-Hartman */ 260796fd7ce5SGreg Kroah-Hartman case TIOCSBRK: /* Turn break on, unconditionally */ 260896fd7ce5SGreg Kroah-Hartman if (tty->ops->break_ctl) 260996fd7ce5SGreg Kroah-Hartman return tty->ops->break_ctl(tty, -1); 261096fd7ce5SGreg Kroah-Hartman return 0; 261196fd7ce5SGreg Kroah-Hartman case TIOCCBRK: /* Turn break off, unconditionally */ 261296fd7ce5SGreg Kroah-Hartman if (tty->ops->break_ctl) 261396fd7ce5SGreg Kroah-Hartman return tty->ops->break_ctl(tty, 0); 261496fd7ce5SGreg Kroah-Hartman return 0; 261596fd7ce5SGreg Kroah-Hartman case TCSBRK: /* SVID version: non-zero arg --> no break */ 261696fd7ce5SGreg Kroah-Hartman /* non-zero arg means wait for all output data 261796fd7ce5SGreg Kroah-Hartman * to be sent (performed above) but don't send break. 261896fd7ce5SGreg Kroah-Hartman * This is used by the tcdrain() termios function. 261996fd7ce5SGreg Kroah-Hartman */ 262096fd7ce5SGreg Kroah-Hartman if (!arg) 262196fd7ce5SGreg Kroah-Hartman return send_break(tty, 250); 262296fd7ce5SGreg Kroah-Hartman return 0; 262396fd7ce5SGreg Kroah-Hartman case TCSBRKP: /* support for POSIX tcsendbreak() */ 262496fd7ce5SGreg Kroah-Hartman return send_break(tty, arg ? arg*100 : 250); 262596fd7ce5SGreg Kroah-Hartman 262696fd7ce5SGreg Kroah-Hartman case TIOCMGET: 262760b33c13SAlan Cox return tty_tiocmget(tty, p); 262896fd7ce5SGreg Kroah-Hartman case TIOCMSET: 262996fd7ce5SGreg Kroah-Hartman case TIOCMBIC: 263096fd7ce5SGreg Kroah-Hartman case TIOCMBIS: 263120b9d177SAlan Cox return tty_tiocmset(tty, cmd, p); 263296fd7ce5SGreg Kroah-Hartman case TIOCGICOUNT: 2633a3096199SAl Viro return tty_tiocgicount(tty, p); 263496fd7ce5SGreg Kroah-Hartman case TCFLSH: 263596fd7ce5SGreg Kroah-Hartman switch (arg) { 263696fd7ce5SGreg Kroah-Hartman case TCIFLUSH: 263796fd7ce5SGreg Kroah-Hartman case TCIOFLUSH: 263896fd7ce5SGreg Kroah-Hartman /* flush tty buffer and allow ldisc to process ioctl */ 263986c80a8eSPeter Hurley tty_buffer_flush(tty, NULL); 264096fd7ce5SGreg Kroah-Hartman break; 264196fd7ce5SGreg Kroah-Hartman } 264296fd7ce5SGreg Kroah-Hartman break; 26438a8ae62fSJiri Slaby case TIOCSSERIAL: 2644930236a3SAl Viro return tty_tiocsserial(tty, p); 26452f46a2c1SAl Viro case TIOCGSERIAL: 2646930236a3SAl Viro return tty_tiocgserial(tty, p); 2647311fc65cSEric W. Biederman case TIOCGPTPEER: 2648311fc65cSEric W. Biederman /* Special because the struct file is needed */ 2649311fc65cSEric W. Biederman return ptm_open_peer(file, tty, (int)arg); 2650a1235b3eSNicolas Pitre default: 2651a1235b3eSNicolas Pitre retval = tty_jobctrl_ioctl(tty, real_tty, file, cmd, arg); 2652a1235b3eSNicolas Pitre if (retval != -ENOIOCTLCMD) 2653a1235b3eSNicolas Pitre return retval; 265496fd7ce5SGreg Kroah-Hartman } 265596fd7ce5SGreg Kroah-Hartman if (tty->ops->ioctl) { 2656c961bfb1SPeter Hurley retval = tty->ops->ioctl(tty, cmd, arg); 265796fd7ce5SGreg Kroah-Hartman if (retval != -ENOIOCTLCMD) 265896fd7ce5SGreg Kroah-Hartman return retval; 265996fd7ce5SGreg Kroah-Hartman } 266096fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 2661e55afd11SPeter Hurley if (!ld) 2662e55afd11SPeter Hurley return hung_up_tty_ioctl(file, cmd, arg); 266396fd7ce5SGreg Kroah-Hartman retval = -EINVAL; 266496fd7ce5SGreg Kroah-Hartman if (ld->ops->ioctl) { 266596fd7ce5SGreg Kroah-Hartman retval = ld->ops->ioctl(tty, file, cmd, arg); 266696fd7ce5SGreg Kroah-Hartman if (retval == -ENOIOCTLCMD) 2667bbb63c51SWanlong Gao retval = -ENOTTY; 266896fd7ce5SGreg Kroah-Hartman } 266996fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 267096fd7ce5SGreg Kroah-Hartman return retval; 267196fd7ce5SGreg Kroah-Hartman } 267296fd7ce5SGreg Kroah-Hartman 267396fd7ce5SGreg Kroah-Hartman #ifdef CONFIG_COMPAT 267477654350SAl Viro 267577654350SAl Viro struct serial_struct32 { 267677654350SAl Viro compat_int_t type; 267777654350SAl Viro compat_int_t line; 267877654350SAl Viro compat_uint_t port; 267977654350SAl Viro compat_int_t irq; 268077654350SAl Viro compat_int_t flags; 268177654350SAl Viro compat_int_t xmit_fifo_size; 268277654350SAl Viro compat_int_t custom_divisor; 268377654350SAl Viro compat_int_t baud_base; 268477654350SAl Viro unsigned short close_delay; 268577654350SAl Viro char io_type; 268677654350SAl Viro char reserved_char[1]; 268777654350SAl Viro compat_int_t hub6; 268877654350SAl Viro unsigned short closing_wait; /* time to wait before closing */ 268977654350SAl Viro unsigned short closing_wait2; /* no longer used... */ 269077654350SAl Viro compat_uint_t iomem_base; 269177654350SAl Viro unsigned short iomem_reg_shift; 269277654350SAl Viro unsigned int port_high; 269377654350SAl Viro /* compat_ulong_t iomap_base FIXME */ 269477654350SAl Viro compat_int_t reserved[1]; 269577654350SAl Viro }; 269677654350SAl Viro 269777654350SAl Viro static int compat_tty_tiocsserial(struct tty_struct *tty, 269877654350SAl Viro struct serial_struct32 __user *ss) 269977654350SAl Viro { 270077654350SAl Viro static DEFINE_RATELIMIT_STATE(depr_flags, 270177654350SAl Viro DEFAULT_RATELIMIT_INTERVAL, 270277654350SAl Viro DEFAULT_RATELIMIT_BURST); 270377654350SAl Viro char comm[TASK_COMM_LEN]; 270477654350SAl Viro struct serial_struct32 v32; 270577654350SAl Viro struct serial_struct v; 270677654350SAl Viro int flags; 270777654350SAl Viro 270877654350SAl Viro if (copy_from_user(&v32, ss, sizeof(struct serial_struct32))) 270977654350SAl Viro return -EFAULT; 271077654350SAl Viro 271177654350SAl Viro memcpy(&v, &v32, offsetof(struct serial_struct32, iomem_base)); 271277654350SAl Viro v.iomem_base = compat_ptr(v32.iomem_base); 271377654350SAl Viro v.iomem_reg_shift = v32.iomem_reg_shift; 271477654350SAl Viro v.port_high = v32.port_high; 271577654350SAl Viro v.iomap_base = 0; 271677654350SAl Viro 271777654350SAl Viro flags = v.flags & ASYNC_DEPRECATED; 271877654350SAl Viro 271977654350SAl Viro if (flags && __ratelimit(&depr_flags)) 272077654350SAl Viro pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", 272177654350SAl Viro __func__, get_task_comm(comm, current), flags); 272277654350SAl Viro if (!tty->ops->set_serial) 272377654350SAl Viro return -ENOTTY; 272477654350SAl Viro return tty->ops->set_serial(tty, &v); 272577654350SAl Viro } 272677654350SAl Viro 272777654350SAl Viro static int compat_tty_tiocgserial(struct tty_struct *tty, 272877654350SAl Viro struct serial_struct32 __user *ss) 272977654350SAl Viro { 273077654350SAl Viro struct serial_struct32 v32; 273177654350SAl Viro struct serial_struct v; 273277654350SAl Viro int err; 273377654350SAl Viro memset(&v, 0, sizeof(struct serial_struct)); 273477654350SAl Viro 273577654350SAl Viro if (!tty->ops->set_serial) 273677654350SAl Viro return -ENOTTY; 273777654350SAl Viro err = tty->ops->get_serial(tty, &v); 273877654350SAl Viro if (!err) { 273977654350SAl Viro memcpy(&v32, &v, offsetof(struct serial_struct32, iomem_base)); 274077654350SAl Viro v32.iomem_base = (unsigned long)v.iomem_base >> 32 ? 274177654350SAl Viro 0xfffffff : ptr_to_compat(v.iomem_base); 274277654350SAl Viro v32.iomem_reg_shift = v.iomem_reg_shift; 274377654350SAl Viro v32.port_high = v.port_high; 274477654350SAl Viro if (copy_to_user(ss, &v32, sizeof(struct serial_struct32))) 274577654350SAl Viro err = -EFAULT; 274677654350SAl Viro } 274777654350SAl Viro return err; 274877654350SAl Viro } 274996fd7ce5SGreg Kroah-Hartman static long tty_compat_ioctl(struct file *file, unsigned int cmd, 275096fd7ce5SGreg Kroah-Hartman unsigned long arg) 275196fd7ce5SGreg Kroah-Hartman { 275296fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = file_tty(file); 275396fd7ce5SGreg Kroah-Hartman struct tty_ldisc *ld; 275496fd7ce5SGreg Kroah-Hartman int retval = -ENOIOCTLCMD; 275596fd7ce5SGreg Kroah-Hartman 2756e2112038SAl Viro switch (cmd) { 2757e2112038SAl Viro case TIOCSTI: 2758e2112038SAl Viro case TIOCGWINSZ: 2759e2112038SAl Viro case TIOCSWINSZ: 2760e2112038SAl Viro case TIOCGEXCL: 2761e2112038SAl Viro case TIOCGETD: 2762e2112038SAl Viro case TIOCSETD: 2763e2112038SAl Viro case TIOCGDEV: 2764e2112038SAl Viro case TIOCMGET: 2765e2112038SAl Viro case TIOCMSET: 2766e2112038SAl Viro case TIOCMBIC: 2767e2112038SAl Viro case TIOCMBIS: 2768e2112038SAl Viro case TIOCGICOUNT: 2769e2112038SAl Viro case TIOCGPGRP: 2770e2112038SAl Viro case TIOCSPGRP: 2771e2112038SAl Viro case TIOCGSID: 2772e2112038SAl Viro case TIOCSERGETLSR: 2773e2112038SAl Viro case TIOCGRS485: 2774e2112038SAl Viro case TIOCSRS485: 2775e2112038SAl Viro #ifdef TIOCGETP 2776e2112038SAl Viro case TIOCGETP: 2777e2112038SAl Viro case TIOCSETP: 2778e2112038SAl Viro case TIOCSETN: 2779e2112038SAl Viro #endif 2780e2112038SAl Viro #ifdef TIOCGETC 2781e2112038SAl Viro case TIOCGETC: 2782e2112038SAl Viro case TIOCSETC: 2783e2112038SAl Viro #endif 2784e2112038SAl Viro #ifdef TIOCGLTC 2785e2112038SAl Viro case TIOCGLTC: 2786e2112038SAl Viro case TIOCSLTC: 2787e2112038SAl Viro #endif 2788e2112038SAl Viro case TCSETSF: 2789e2112038SAl Viro case TCSETSW: 2790e2112038SAl Viro case TCSETS: 2791e2112038SAl Viro case TCGETS: 2792e2112038SAl Viro #ifdef TCGETS2 2793e2112038SAl Viro case TCGETS2: 2794e2112038SAl Viro case TCSETSF2: 2795e2112038SAl Viro case TCSETSW2: 2796e2112038SAl Viro case TCSETS2: 2797e2112038SAl Viro #endif 2798e2112038SAl Viro case TCGETA: 2799e2112038SAl Viro case TCSETAF: 2800e2112038SAl Viro case TCSETAW: 2801e2112038SAl Viro case TCSETA: 2802e2112038SAl Viro case TIOCGLCKTRMIOS: 2803e2112038SAl Viro case TIOCSLCKTRMIOS: 2804e2112038SAl Viro #ifdef TCGETX 2805e2112038SAl Viro case TCGETX: 2806e2112038SAl Viro case TCSETX: 2807e2112038SAl Viro case TCSETXW: 2808e2112038SAl Viro case TCSETXF: 2809e2112038SAl Viro #endif 2810e2112038SAl Viro case TIOCGSOFTCAR: 2811e2112038SAl Viro case TIOCSSOFTCAR: 2812e2112038SAl Viro return tty_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 2813e2112038SAl Viro case TIOCCONS: 2814e2112038SAl Viro case TIOCEXCL: 2815e2112038SAl Viro case TIOCNXCL: 2816e2112038SAl Viro case TIOCVHANGUP: 2817e2112038SAl Viro case TIOCSBRK: 2818e2112038SAl Viro case TIOCCBRK: 2819e2112038SAl Viro case TCSBRK: 2820e2112038SAl Viro case TCSBRKP: 2821e2112038SAl Viro case TCFLSH: 2822e2112038SAl Viro case TIOCGPTPEER: 2823e2112038SAl Viro case TIOCNOTTY: 2824e2112038SAl Viro case TIOCSCTTY: 2825e2112038SAl Viro case TCXONC: 2826e2112038SAl Viro case TIOCMIWAIT: 2827e2112038SAl Viro case TIOCSERCONFIG: 2828e2112038SAl Viro return tty_ioctl(file, cmd, arg); 2829e2112038SAl Viro } 2830e2112038SAl Viro 28316131ffaaSAl Viro if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl")) 283296fd7ce5SGreg Kroah-Hartman return -EINVAL; 283396fd7ce5SGreg Kroah-Hartman 283477654350SAl Viro switch (cmd) { 283577654350SAl Viro case TIOCSSERIAL: 283677654350SAl Viro return compat_tty_tiocsserial(tty, compat_ptr(arg)); 283777654350SAl Viro case TIOCGSERIAL: 283877654350SAl Viro return compat_tty_tiocgserial(tty, compat_ptr(arg)); 283977654350SAl Viro } 284096fd7ce5SGreg Kroah-Hartman if (tty->ops->compat_ioctl) { 2841c961bfb1SPeter Hurley retval = tty->ops->compat_ioctl(tty, cmd, arg); 284296fd7ce5SGreg Kroah-Hartman if (retval != -ENOIOCTLCMD) 284396fd7ce5SGreg Kroah-Hartman return retval; 284496fd7ce5SGreg Kroah-Hartman } 284596fd7ce5SGreg Kroah-Hartman 284696fd7ce5SGreg Kroah-Hartman ld = tty_ldisc_ref_wait(tty); 2847e55afd11SPeter Hurley if (!ld) 2848e55afd11SPeter Hurley return hung_up_tty_compat_ioctl(file, cmd, arg); 284996fd7ce5SGreg Kroah-Hartman if (ld->ops->compat_ioctl) 285096fd7ce5SGreg Kroah-Hartman retval = ld->ops->compat_ioctl(tty, file, cmd, arg); 2851f0193d3eSAl Viro if (retval == -ENOIOCTLCMD && ld->ops->ioctl) 2852f0193d3eSAl Viro retval = ld->ops->ioctl(tty, file, 2853f0193d3eSAl Viro (unsigned long)compat_ptr(cmd), arg); 285496fd7ce5SGreg Kroah-Hartman tty_ldisc_deref(ld); 285596fd7ce5SGreg Kroah-Hartman 285696fd7ce5SGreg Kroah-Hartman return retval; 285796fd7ce5SGreg Kroah-Hartman } 285896fd7ce5SGreg Kroah-Hartman #endif 285996fd7ce5SGreg Kroah-Hartman 2860c3c073f8SAl Viro static int this_tty(const void *t, struct file *file, unsigned fd) 2861c3c073f8SAl Viro { 2862c3c073f8SAl Viro if (likely(file->f_op->read != tty_read)) 2863c3c073f8SAl Viro return 0; 2864c3c073f8SAl Viro return file_tty(file) != t ? 0 : fd + 1; 2865c3c073f8SAl Viro } 2866c3c073f8SAl Viro 286796fd7ce5SGreg Kroah-Hartman /* 286896fd7ce5SGreg Kroah-Hartman * This implements the "Secure Attention Key" --- the idea is to 286996fd7ce5SGreg Kroah-Hartman * prevent trojan horses by killing all processes associated with this 287096fd7ce5SGreg Kroah-Hartman * tty when the user hits the "Secure Attention Key". Required for 287196fd7ce5SGreg Kroah-Hartman * super-paranoid applications --- see the Orange Book for more details. 287296fd7ce5SGreg Kroah-Hartman * 287396fd7ce5SGreg Kroah-Hartman * This code could be nicer; ideally it should send a HUP, wait a few 287496fd7ce5SGreg Kroah-Hartman * seconds, then send a INT, and then a KILL signal. But you then 287596fd7ce5SGreg Kroah-Hartman * have to coordinate with the init process, since all processes associated 287696fd7ce5SGreg Kroah-Hartman * with the current tty must be dead before the new getty is allowed 287796fd7ce5SGreg Kroah-Hartman * to spawn. 287896fd7ce5SGreg Kroah-Hartman * 287996fd7ce5SGreg Kroah-Hartman * Now, if it would be correct ;-/ The current code has a nasty hole - 288096fd7ce5SGreg Kroah-Hartman * it doesn't catch files in flight. We may send the descriptor to ourselves 288196fd7ce5SGreg Kroah-Hartman * via AF_UNIX socket, close it and later fetch from socket. FIXME. 288296fd7ce5SGreg Kroah-Hartman * 288396fd7ce5SGreg Kroah-Hartman * Nasty bug: do_SAK is being called in interrupt context. This can 288496fd7ce5SGreg Kroah-Hartman * deadlock. We punt it up to process context. AKPM - 16Mar2001 288596fd7ce5SGreg Kroah-Hartman */ 288696fd7ce5SGreg Kroah-Hartman void __do_SAK(struct tty_struct *tty) 288796fd7ce5SGreg Kroah-Hartman { 288896fd7ce5SGreg Kroah-Hartman #ifdef TTY_SOFT_SAK 288996fd7ce5SGreg Kroah-Hartman tty_hangup(tty); 289096fd7ce5SGreg Kroah-Hartman #else 289196fd7ce5SGreg Kroah-Hartman struct task_struct *g, *p; 289296fd7ce5SGreg Kroah-Hartman struct pid *session; 289396fd7ce5SGreg Kroah-Hartman int i; 289496fd7ce5SGreg Kroah-Hartman 289596fd7ce5SGreg Kroah-Hartman if (!tty) 289696fd7ce5SGreg Kroah-Hartman return; 289796fd7ce5SGreg Kroah-Hartman session = tty->session; 289896fd7ce5SGreg Kroah-Hartman 289996fd7ce5SGreg Kroah-Hartman tty_ldisc_flush(tty); 290096fd7ce5SGreg Kroah-Hartman 290196fd7ce5SGreg Kroah-Hartman tty_driver_flush_buffer(tty); 290296fd7ce5SGreg Kroah-Hartman 290396fd7ce5SGreg Kroah-Hartman read_lock(&tasklist_lock); 290496fd7ce5SGreg Kroah-Hartman /* Kill the entire session */ 290596fd7ce5SGreg Kroah-Hartman do_each_pid_task(session, PIDTYPE_SID, p) { 29069b42bb75SPeter Hurley tty_notice(tty, "SAK: killed process %d (%s): by session\n", 290796fd7ce5SGreg Kroah-Hartman task_pid_nr(p), p->comm); 2908a8ebd171SEric W. Biederman group_send_sig_info(SIGKILL, SEND_SIG_PRIV, p, PIDTYPE_SID); 290996fd7ce5SGreg Kroah-Hartman } while_each_pid_task(session, PIDTYPE_SID, p); 29109b42bb75SPeter Hurley 29119b42bb75SPeter Hurley /* Now kill any processes that happen to have the tty open */ 291296fd7ce5SGreg Kroah-Hartman do_each_thread(g, p) { 291396fd7ce5SGreg Kroah-Hartman if (p->signal->tty == tty) { 29149b42bb75SPeter Hurley tty_notice(tty, "SAK: killed process %d (%s): by controlling tty\n", 291596fd7ce5SGreg Kroah-Hartman task_pid_nr(p), p->comm); 2916a8ebd171SEric W. Biederman group_send_sig_info(SIGKILL, SEND_SIG_PRIV, p, PIDTYPE_SID); 291796fd7ce5SGreg Kroah-Hartman continue; 291896fd7ce5SGreg Kroah-Hartman } 291996fd7ce5SGreg Kroah-Hartman task_lock(p); 2920c3c073f8SAl Viro i = iterate_fd(p->files, 0, this_tty, tty); 2921c3c073f8SAl Viro if (i != 0) { 29229b42bb75SPeter Hurley tty_notice(tty, "SAK: killed process %d (%s): by fd#%d\n", 2923c3c073f8SAl Viro task_pid_nr(p), p->comm, i - 1); 2924a8ebd171SEric W. Biederman group_send_sig_info(SIGKILL, SEND_SIG_PRIV, p, PIDTYPE_SID); 292596fd7ce5SGreg Kroah-Hartman } 292696fd7ce5SGreg Kroah-Hartman task_unlock(p); 292796fd7ce5SGreg Kroah-Hartman } while_each_thread(g, p); 292896fd7ce5SGreg Kroah-Hartman read_unlock(&tasklist_lock); 292996fd7ce5SGreg Kroah-Hartman #endif 293096fd7ce5SGreg Kroah-Hartman } 293196fd7ce5SGreg Kroah-Hartman 293296fd7ce5SGreg Kroah-Hartman static void do_SAK_work(struct work_struct *work) 293396fd7ce5SGreg Kroah-Hartman { 293496fd7ce5SGreg Kroah-Hartman struct tty_struct *tty = 293596fd7ce5SGreg Kroah-Hartman container_of(work, struct tty_struct, SAK_work); 293696fd7ce5SGreg Kroah-Hartman __do_SAK(tty); 293796fd7ce5SGreg Kroah-Hartman } 293896fd7ce5SGreg Kroah-Hartman 293996fd7ce5SGreg Kroah-Hartman /* 294096fd7ce5SGreg Kroah-Hartman * The tq handling here is a little racy - tty->SAK_work may already be queued. 294196fd7ce5SGreg Kroah-Hartman * Fortunately we don't need to worry, because if ->SAK_work is already queued, 294296fd7ce5SGreg Kroah-Hartman * the values which we write to it will be identical to the values which it 294396fd7ce5SGreg Kroah-Hartman * already has. --akpm 294496fd7ce5SGreg Kroah-Hartman */ 294596fd7ce5SGreg Kroah-Hartman void do_SAK(struct tty_struct *tty) 294696fd7ce5SGreg Kroah-Hartman { 294796fd7ce5SGreg Kroah-Hartman if (!tty) 294896fd7ce5SGreg Kroah-Hartman return; 294996fd7ce5SGreg Kroah-Hartman schedule_work(&tty->SAK_work); 295096fd7ce5SGreg Kroah-Hartman } 295196fd7ce5SGreg Kroah-Hartman 295296fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(do_SAK); 295396fd7ce5SGreg Kroah-Hartman 295496fd7ce5SGreg Kroah-Hartman /* Must put_device() after it's unused! */ 295596fd7ce5SGreg Kroah-Hartman static struct device *tty_get_device(struct tty_struct *tty) 295696fd7ce5SGreg Kroah-Hartman { 295796fd7ce5SGreg Kroah-Hartman dev_t devt = tty_devnum(tty); 29584495dfddSSuzuki K Poulose return class_find_device_by_devt(tty_class, devt); 295996fd7ce5SGreg Kroah-Hartman } 296096fd7ce5SGreg Kroah-Hartman 296196fd7ce5SGreg Kroah-Hartman 296296fd7ce5SGreg Kroah-Hartman /** 29632c964a2fSRasmus Villemoes * alloc_tty_struct 296496fd7ce5SGreg Kroah-Hartman * 29652c964a2fSRasmus Villemoes * This subroutine allocates and initializes a tty structure. 296696fd7ce5SGreg Kroah-Hartman * 29672c964a2fSRasmus Villemoes * Locking: none - tty in question is not exposed at this point 296896fd7ce5SGreg Kroah-Hartman */ 296996fd7ce5SGreg Kroah-Hartman 29702c964a2fSRasmus Villemoes struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx) 297196fd7ce5SGreg Kroah-Hartman { 29722c964a2fSRasmus Villemoes struct tty_struct *tty; 29732c964a2fSRasmus Villemoes 29742c964a2fSRasmus Villemoes tty = kzalloc(sizeof(*tty), GFP_KERNEL); 29752c964a2fSRasmus Villemoes if (!tty) 29762c964a2fSRasmus Villemoes return NULL; 29772c964a2fSRasmus Villemoes 297896fd7ce5SGreg Kroah-Hartman kref_init(&tty->kref); 297996fd7ce5SGreg Kroah-Hartman tty->magic = TTY_MAGIC; 2980903f9db1STetsuo Handa if (tty_ldisc_init(tty)) { 2981903f9db1STetsuo Handa kfree(tty); 2982903f9db1STetsuo Handa return NULL; 2983903f9db1STetsuo Handa } 298496fd7ce5SGreg Kroah-Hartman tty->session = NULL; 298596fd7ce5SGreg Kroah-Hartman tty->pgrp = NULL; 298689c8d91eSAlan Cox mutex_init(&tty->legacy_mutex); 2987d8c1f929SPeter Hurley mutex_init(&tty->throttle_mutex); 29886a1c0680SPeter Hurley init_rwsem(&tty->termios_rwsem); 2989dee4a0beSPeter Hurley mutex_init(&tty->winsize_mutex); 299036697529SPeter Hurley init_ldsem(&tty->ldisc_sem); 299196fd7ce5SGreg Kroah-Hartman init_waitqueue_head(&tty->write_wait); 299296fd7ce5SGreg Kroah-Hartman init_waitqueue_head(&tty->read_wait); 299396fd7ce5SGreg Kroah-Hartman INIT_WORK(&tty->hangup_work, do_tty_hangup); 299496fd7ce5SGreg Kroah-Hartman mutex_init(&tty->atomic_write_lock); 299596fd7ce5SGreg Kroah-Hartman spin_lock_init(&tty->ctrl_lock); 2996f9e053dcSPeter Hurley spin_lock_init(&tty->flow_lock); 29974a510969SPeter Hurley spin_lock_init(&tty->files_lock); 299896fd7ce5SGreg Kroah-Hartman INIT_LIST_HEAD(&tty->tty_files); 299996fd7ce5SGreg Kroah-Hartman INIT_WORK(&tty->SAK_work, do_SAK_work); 300096fd7ce5SGreg Kroah-Hartman 300196fd7ce5SGreg Kroah-Hartman tty->driver = driver; 300296fd7ce5SGreg Kroah-Hartman tty->ops = driver->ops; 300396fd7ce5SGreg Kroah-Hartman tty->index = idx; 300496fd7ce5SGreg Kroah-Hartman tty_line_name(driver, idx, tty->name); 300596fd7ce5SGreg Kroah-Hartman tty->dev = tty_get_device(tty); 30062c964a2fSRasmus Villemoes 30072c964a2fSRasmus Villemoes return tty; 300896fd7ce5SGreg Kroah-Hartman } 300996fd7ce5SGreg Kroah-Hartman 301096fd7ce5SGreg Kroah-Hartman /** 301196fd7ce5SGreg Kroah-Hartman * tty_put_char - write one character to a tty 301296fd7ce5SGreg Kroah-Hartman * @tty: tty 301396fd7ce5SGreg Kroah-Hartman * @ch: character 301496fd7ce5SGreg Kroah-Hartman * 301596fd7ce5SGreg Kroah-Hartman * Write one byte to the tty using the provided put_char method 301696fd7ce5SGreg Kroah-Hartman * if present. Returns the number of characters successfully output. 301796fd7ce5SGreg Kroah-Hartman * 301896fd7ce5SGreg Kroah-Hartman * Note: the specific put_char operation in the driver layer may go 301996fd7ce5SGreg Kroah-Hartman * away soon. Don't call it directly, use this method 302096fd7ce5SGreg Kroah-Hartman */ 302196fd7ce5SGreg Kroah-Hartman 302296fd7ce5SGreg Kroah-Hartman int tty_put_char(struct tty_struct *tty, unsigned char ch) 302396fd7ce5SGreg Kroah-Hartman { 302496fd7ce5SGreg Kroah-Hartman if (tty->ops->put_char) 302596fd7ce5SGreg Kroah-Hartman return tty->ops->put_char(tty, ch); 302696fd7ce5SGreg Kroah-Hartman return tty->ops->write(tty, &ch, 1); 302796fd7ce5SGreg Kroah-Hartman } 302896fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(tty_put_char); 302996fd7ce5SGreg Kroah-Hartman 303096fd7ce5SGreg Kroah-Hartman struct class *tty_class; 303196fd7ce5SGreg Kroah-Hartman 30327e73eca6SJiri Slaby static int tty_cdev_add(struct tty_driver *driver, dev_t dev, 30337e73eca6SJiri Slaby unsigned int index, unsigned int count) 30347e73eca6SJiri Slaby { 3035c1a752baSLeon Yu int err; 3036c1a752baSLeon Yu 30377e73eca6SJiri Slaby /* init here, since reused cdevs cause crashes */ 3038a3a10ce3SRichard Watts driver->cdevs[index] = cdev_alloc(); 3039a3a10ce3SRichard Watts if (!driver->cdevs[index]) 3040a3a10ce3SRichard Watts return -ENOMEM; 3041c1a752baSLeon Yu driver->cdevs[index]->ops = &tty_fops; 3042a3a10ce3SRichard Watts driver->cdevs[index]->owner = driver->owner; 3043c1a752baSLeon Yu err = cdev_add(driver->cdevs[index], dev, count); 3044c1a752baSLeon Yu if (err) 3045c1a752baSLeon Yu kobject_put(&driver->cdevs[index]->kobj); 3046c1a752baSLeon Yu return err; 30477e73eca6SJiri Slaby } 30487e73eca6SJiri Slaby 304996fd7ce5SGreg Kroah-Hartman /** 305096fd7ce5SGreg Kroah-Hartman * tty_register_device - register a tty device 305196fd7ce5SGreg Kroah-Hartman * @driver: the tty driver that describes the tty device 305296fd7ce5SGreg Kroah-Hartman * @index: the index in the tty driver for this tty device 305396fd7ce5SGreg Kroah-Hartman * @device: a struct device that is associated with this tty device. 305496fd7ce5SGreg Kroah-Hartman * This field is optional, if there is no known struct device 305596fd7ce5SGreg Kroah-Hartman * for this tty device it can be set to NULL safely. 305696fd7ce5SGreg Kroah-Hartman * 305796fd7ce5SGreg Kroah-Hartman * Returns a pointer to the struct device for this tty device 305896fd7ce5SGreg Kroah-Hartman * (or ERR_PTR(-EFOO) on error). 305996fd7ce5SGreg Kroah-Hartman * 306096fd7ce5SGreg Kroah-Hartman * This call is required to be made to register an individual tty device 306196fd7ce5SGreg Kroah-Hartman * if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If 306296fd7ce5SGreg Kroah-Hartman * that bit is not set, this function should not be called by a tty 306396fd7ce5SGreg Kroah-Hartman * driver. 306496fd7ce5SGreg Kroah-Hartman * 306596fd7ce5SGreg Kroah-Hartman * Locking: ?? 306696fd7ce5SGreg Kroah-Hartman */ 306796fd7ce5SGreg Kroah-Hartman 306896fd7ce5SGreg Kroah-Hartman struct device *tty_register_device(struct tty_driver *driver, unsigned index, 306996fd7ce5SGreg Kroah-Hartman struct device *device) 307096fd7ce5SGreg Kroah-Hartman { 30716915c0e4STomas Hlavacek return tty_register_device_attr(driver, index, device, NULL, NULL); 30726915c0e4STomas Hlavacek } 30736915c0e4STomas Hlavacek EXPORT_SYMBOL(tty_register_device); 30746915c0e4STomas Hlavacek 3075b1b79916STomas Hlavacek static void tty_device_create_release(struct device *dev) 3076b1b79916STomas Hlavacek { 307783db1df4SPeter Hurley dev_dbg(dev, "releasing...\n"); 3078b1b79916STomas Hlavacek kfree(dev); 3079b1b79916STomas Hlavacek } 3080b1b79916STomas Hlavacek 30816915c0e4STomas Hlavacek /** 30826915c0e4STomas Hlavacek * tty_register_device_attr - register a tty device 30836915c0e4STomas Hlavacek * @driver: the tty driver that describes the tty device 30846915c0e4STomas Hlavacek * @index: the index in the tty driver for this tty device 30856915c0e4STomas Hlavacek * @device: a struct device that is associated with this tty device. 30866915c0e4STomas Hlavacek * This field is optional, if there is no known struct device 30876915c0e4STomas Hlavacek * for this tty device it can be set to NULL safely. 30886915c0e4STomas Hlavacek * @drvdata: Driver data to be set to device. 30896915c0e4STomas Hlavacek * @attr_grp: Attribute group to be set on device. 30906915c0e4STomas Hlavacek * 30916915c0e4STomas Hlavacek * Returns a pointer to the struct device for this tty device 30926915c0e4STomas Hlavacek * (or ERR_PTR(-EFOO) on error). 30936915c0e4STomas Hlavacek * 30946915c0e4STomas Hlavacek * This call is required to be made to register an individual tty device 30956915c0e4STomas Hlavacek * if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If 30966915c0e4STomas Hlavacek * that bit is not set, this function should not be called by a tty 30976915c0e4STomas Hlavacek * driver. 30986915c0e4STomas Hlavacek * 30996915c0e4STomas Hlavacek * Locking: ?? 31006915c0e4STomas Hlavacek */ 31016915c0e4STomas Hlavacek struct device *tty_register_device_attr(struct tty_driver *driver, 31026915c0e4STomas Hlavacek unsigned index, struct device *device, 31036915c0e4STomas Hlavacek void *drvdata, 31046915c0e4STomas Hlavacek const struct attribute_group **attr_grp) 31056915c0e4STomas Hlavacek { 310696fd7ce5SGreg Kroah-Hartman char name[64]; 31076915c0e4STomas Hlavacek dev_t devt = MKDEV(driver->major, driver->minor_start) + index; 310893857eddSJohan Hovold struct ktermios *tp; 31096a7e6f78SJohan Hovold struct device *dev; 31106a7e6f78SJohan Hovold int retval; 311196fd7ce5SGreg Kroah-Hartman 311296fd7ce5SGreg Kroah-Hartman if (index >= driver->num) { 3113656fb867SPeter Hurley pr_err("%s: Attempt to register invalid tty line number (%d)\n", 3114656fb867SPeter Hurley driver->name, index); 311596fd7ce5SGreg Kroah-Hartman return ERR_PTR(-EINVAL); 311696fd7ce5SGreg Kroah-Hartman } 311796fd7ce5SGreg Kroah-Hartman 311896fd7ce5SGreg Kroah-Hartman if (driver->type == TTY_DRIVER_TYPE_PTY) 311996fd7ce5SGreg Kroah-Hartman pty_line_name(driver, index, name); 312096fd7ce5SGreg Kroah-Hartman else 312196fd7ce5SGreg Kroah-Hartman tty_line_name(driver, index, name); 312296fd7ce5SGreg Kroah-Hartman 31236915c0e4STomas Hlavacek dev = kzalloc(sizeof(*dev), GFP_KERNEL); 31246a7e6f78SJohan Hovold if (!dev) 31256a7e6f78SJohan Hovold return ERR_PTR(-ENOMEM); 31266915c0e4STomas Hlavacek 31276915c0e4STomas Hlavacek dev->devt = devt; 31286915c0e4STomas Hlavacek dev->class = tty_class; 31296915c0e4STomas Hlavacek dev->parent = device; 3130b1b79916STomas Hlavacek dev->release = tty_device_create_release; 31316915c0e4STomas Hlavacek dev_set_name(dev, "%s", name); 31326915c0e4STomas Hlavacek dev->groups = attr_grp; 31336915c0e4STomas Hlavacek dev_set_drvdata(dev, drvdata); 31346915c0e4STomas Hlavacek 31356a7e6f78SJohan Hovold dev_set_uevent_suppress(dev, 1); 31366a7e6f78SJohan Hovold 31376915c0e4STomas Hlavacek retval = device_register(dev); 31386915c0e4STomas Hlavacek if (retval) 31396a7e6f78SJohan Hovold goto err_put; 31406a7e6f78SJohan Hovold 31416a7e6f78SJohan Hovold if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { 314293857eddSJohan Hovold /* 314393857eddSJohan Hovold * Free any saved termios data so that the termios state is 314493857eddSJohan Hovold * reset when reusing a minor number. 314593857eddSJohan Hovold */ 314693857eddSJohan Hovold tp = driver->termios[index]; 314793857eddSJohan Hovold if (tp) { 314893857eddSJohan Hovold driver->termios[index] = NULL; 314993857eddSJohan Hovold kfree(tp); 315093857eddSJohan Hovold } 315193857eddSJohan Hovold 31526a7e6f78SJohan Hovold retval = tty_cdev_add(driver, devt, index, 1); 31536a7e6f78SJohan Hovold if (retval) 31546a7e6f78SJohan Hovold goto err_del; 31556a7e6f78SJohan Hovold } 31566a7e6f78SJohan Hovold 31576a7e6f78SJohan Hovold dev_set_uevent_suppress(dev, 0); 31586a7e6f78SJohan Hovold kobject_uevent(&dev->kobj, KOBJ_ADD); 31596915c0e4STomas Hlavacek 31606915c0e4STomas Hlavacek return dev; 31616915c0e4STomas Hlavacek 31626a7e6f78SJohan Hovold err_del: 31636a7e6f78SJohan Hovold device_del(dev); 31646a7e6f78SJohan Hovold err_put: 31656915c0e4STomas Hlavacek put_device(dev); 31666a7e6f78SJohan Hovold 31676915c0e4STomas Hlavacek return ERR_PTR(retval); 31686915c0e4STomas Hlavacek } 31696915c0e4STomas Hlavacek EXPORT_SYMBOL_GPL(tty_register_device_attr); 317096fd7ce5SGreg Kroah-Hartman 317196fd7ce5SGreg Kroah-Hartman /** 317296fd7ce5SGreg Kroah-Hartman * tty_unregister_device - unregister a tty device 317396fd7ce5SGreg Kroah-Hartman * @driver: the tty driver that describes the tty device 317496fd7ce5SGreg Kroah-Hartman * @index: the index in the tty driver for this tty device 317596fd7ce5SGreg Kroah-Hartman * 317696fd7ce5SGreg Kroah-Hartman * If a tty device is registered with a call to tty_register_device() then 317796fd7ce5SGreg Kroah-Hartman * this function must be called when the tty device is gone. 317896fd7ce5SGreg Kroah-Hartman * 317996fd7ce5SGreg Kroah-Hartman * Locking: ?? 318096fd7ce5SGreg Kroah-Hartman */ 318196fd7ce5SGreg Kroah-Hartman 318296fd7ce5SGreg Kroah-Hartman void tty_unregister_device(struct tty_driver *driver, unsigned index) 318396fd7ce5SGreg Kroah-Hartman { 318496fd7ce5SGreg Kroah-Hartman device_destroy(tty_class, 318596fd7ce5SGreg Kroah-Hartman MKDEV(driver->major, driver->minor_start) + index); 3186a3a10ce3SRichard Watts if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { 3187a3a10ce3SRichard Watts cdev_del(driver->cdevs[index]); 3188a3a10ce3SRichard Watts driver->cdevs[index] = NULL; 3189a3a10ce3SRichard Watts } 319096fd7ce5SGreg Kroah-Hartman } 319196fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_unregister_device); 319296fd7ce5SGreg Kroah-Hartman 31937f0bc6a6SJiri Slaby /** 31947f0bc6a6SJiri Slaby * __tty_alloc_driver -- allocate tty driver 31957f0bc6a6SJiri Slaby * @lines: count of lines this driver can handle at most 319687838ae3SThadeu Lima de Souza Cascardo * @owner: module which is responsible for this driver 31977f0bc6a6SJiri Slaby * @flags: some of TTY_DRIVER_* flags, will be set in driver->flags 31987f0bc6a6SJiri Slaby * 31997f0bc6a6SJiri Slaby * This should not be called directly, some of the provided macros should be 32007f0bc6a6SJiri Slaby * used instead. Use IS_ERR and friends on @retval. 32017f0bc6a6SJiri Slaby */ 32027f0bc6a6SJiri Slaby struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner, 32037f0bc6a6SJiri Slaby unsigned long flags) 320496fd7ce5SGreg Kroah-Hartman { 320596fd7ce5SGreg Kroah-Hartman struct tty_driver *driver; 32067e73eca6SJiri Slaby unsigned int cdevs = 1; 320716a02081SJiri Slaby int err; 320896fd7ce5SGreg Kroah-Hartman 32090019b408SJiri Slaby if (!lines || (flags & TTY_DRIVER_UNNUMBERED_NODE && lines > 1)) 32107f0bc6a6SJiri Slaby return ERR_PTR(-EINVAL); 32117f0bc6a6SJiri Slaby 321296fd7ce5SGreg Kroah-Hartman driver = kzalloc(sizeof(struct tty_driver), GFP_KERNEL); 32137f0bc6a6SJiri Slaby if (!driver) 32147f0bc6a6SJiri Slaby return ERR_PTR(-ENOMEM); 32157f0bc6a6SJiri Slaby 321696fd7ce5SGreg Kroah-Hartman kref_init(&driver->kref); 321796fd7ce5SGreg Kroah-Hartman driver->magic = TTY_DRIVER_MAGIC; 321896fd7ce5SGreg Kroah-Hartman driver->num = lines; 32191a54a76dSJiri Slaby driver->owner = owner; 32207f0bc6a6SJiri Slaby driver->flags = flags; 322116a02081SJiri Slaby 322216a02081SJiri Slaby if (!(flags & TTY_DRIVER_DEVPTS_MEM)) { 322316a02081SJiri Slaby driver->ttys = kcalloc(lines, sizeof(*driver->ttys), 322416a02081SJiri Slaby GFP_KERNEL); 322516a02081SJiri Slaby driver->termios = kcalloc(lines, sizeof(*driver->termios), 322616a02081SJiri Slaby GFP_KERNEL); 322716a02081SJiri Slaby if (!driver->ttys || !driver->termios) { 322816a02081SJiri Slaby err = -ENOMEM; 322916a02081SJiri Slaby goto err_free_all; 323016a02081SJiri Slaby } 323116a02081SJiri Slaby } 323216a02081SJiri Slaby 323316a02081SJiri Slaby if (!(flags & TTY_DRIVER_DYNAMIC_ALLOC)) { 323416a02081SJiri Slaby driver->ports = kcalloc(lines, sizeof(*driver->ports), 323516a02081SJiri Slaby GFP_KERNEL); 323616a02081SJiri Slaby if (!driver->ports) { 323716a02081SJiri Slaby err = -ENOMEM; 323816a02081SJiri Slaby goto err_free_all; 323916a02081SJiri Slaby } 32407e73eca6SJiri Slaby cdevs = lines; 32417e73eca6SJiri Slaby } 32427e73eca6SJiri Slaby 32437e73eca6SJiri Slaby driver->cdevs = kcalloc(cdevs, sizeof(*driver->cdevs), GFP_KERNEL); 32447e73eca6SJiri Slaby if (!driver->cdevs) { 32457e73eca6SJiri Slaby err = -ENOMEM; 32467e73eca6SJiri Slaby goto err_free_all; 324716a02081SJiri Slaby } 32487f0bc6a6SJiri Slaby 324996fd7ce5SGreg Kroah-Hartman return driver; 325016a02081SJiri Slaby err_free_all: 325116a02081SJiri Slaby kfree(driver->ports); 325216a02081SJiri Slaby kfree(driver->ttys); 325316a02081SJiri Slaby kfree(driver->termios); 3254a3a10ce3SRichard Watts kfree(driver->cdevs); 325516a02081SJiri Slaby kfree(driver); 325616a02081SJiri Slaby return ERR_PTR(err); 325796fd7ce5SGreg Kroah-Hartman } 32587f0bc6a6SJiri Slaby EXPORT_SYMBOL(__tty_alloc_driver); 325996fd7ce5SGreg Kroah-Hartman 326096fd7ce5SGreg Kroah-Hartman static void destruct_tty_driver(struct kref *kref) 326196fd7ce5SGreg Kroah-Hartman { 326296fd7ce5SGreg Kroah-Hartman struct tty_driver *driver = container_of(kref, struct tty_driver, kref); 326396fd7ce5SGreg Kroah-Hartman int i; 326496fd7ce5SGreg Kroah-Hartman struct ktermios *tp; 326596fd7ce5SGreg Kroah-Hartman 326696fd7ce5SGreg Kroah-Hartman if (driver->flags & TTY_DRIVER_INSTALLED) { 326796fd7ce5SGreg Kroah-Hartman for (i = 0; i < driver->num; i++) { 326896fd7ce5SGreg Kroah-Hartman tp = driver->termios[i]; 326996fd7ce5SGreg Kroah-Hartman if (tp) { 327096fd7ce5SGreg Kroah-Hartman driver->termios[i] = NULL; 327196fd7ce5SGreg Kroah-Hartman kfree(tp); 327296fd7ce5SGreg Kroah-Hartman } 327396fd7ce5SGreg Kroah-Hartman if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) 327496fd7ce5SGreg Kroah-Hartman tty_unregister_device(driver, i); 327596fd7ce5SGreg Kroah-Hartman } 327696fd7ce5SGreg Kroah-Hartman proc_tty_unregister_driver(driver); 32777e73eca6SJiri Slaby if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) 3278a3a10ce3SRichard Watts cdev_del(driver->cdevs[0]); 327996fd7ce5SGreg Kroah-Hartman } 32807e73eca6SJiri Slaby kfree(driver->cdevs); 328104831dc1SJiri Slaby kfree(driver->ports); 328216a02081SJiri Slaby kfree(driver->termios); 328316a02081SJiri Slaby kfree(driver->ttys); 328496fd7ce5SGreg Kroah-Hartman kfree(driver); 328596fd7ce5SGreg Kroah-Hartman } 328696fd7ce5SGreg Kroah-Hartman 328796fd7ce5SGreg Kroah-Hartman void tty_driver_kref_put(struct tty_driver *driver) 328896fd7ce5SGreg Kroah-Hartman { 328996fd7ce5SGreg Kroah-Hartman kref_put(&driver->kref, destruct_tty_driver); 329096fd7ce5SGreg Kroah-Hartman } 329196fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_driver_kref_put); 329296fd7ce5SGreg Kroah-Hartman 329396fd7ce5SGreg Kroah-Hartman void tty_set_operations(struct tty_driver *driver, 329496fd7ce5SGreg Kroah-Hartman const struct tty_operations *op) 329596fd7ce5SGreg Kroah-Hartman { 329696fd7ce5SGreg Kroah-Hartman driver->ops = op; 329796fd7ce5SGreg Kroah-Hartman }; 329896fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_set_operations); 329996fd7ce5SGreg Kroah-Hartman 330096fd7ce5SGreg Kroah-Hartman void put_tty_driver(struct tty_driver *d) 330196fd7ce5SGreg Kroah-Hartman { 330296fd7ce5SGreg Kroah-Hartman tty_driver_kref_put(d); 330396fd7ce5SGreg Kroah-Hartman } 330496fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(put_tty_driver); 330596fd7ce5SGreg Kroah-Hartman 330696fd7ce5SGreg Kroah-Hartman /* 330796fd7ce5SGreg Kroah-Hartman * Called by a tty driver to register itself. 330896fd7ce5SGreg Kroah-Hartman */ 330996fd7ce5SGreg Kroah-Hartman int tty_register_driver(struct tty_driver *driver) 331096fd7ce5SGreg Kroah-Hartman { 331196fd7ce5SGreg Kroah-Hartman int error; 331296fd7ce5SGreg Kroah-Hartman int i; 331396fd7ce5SGreg Kroah-Hartman dev_t dev; 331496fd7ce5SGreg Kroah-Hartman struct device *d; 331596fd7ce5SGreg Kroah-Hartman 331696fd7ce5SGreg Kroah-Hartman if (!driver->major) { 331796fd7ce5SGreg Kroah-Hartman error = alloc_chrdev_region(&dev, driver->minor_start, 331896fd7ce5SGreg Kroah-Hartman driver->num, driver->name); 331996fd7ce5SGreg Kroah-Hartman if (!error) { 332096fd7ce5SGreg Kroah-Hartman driver->major = MAJOR(dev); 332196fd7ce5SGreg Kroah-Hartman driver->minor_start = MINOR(dev); 332296fd7ce5SGreg Kroah-Hartman } 332396fd7ce5SGreg Kroah-Hartman } else { 332496fd7ce5SGreg Kroah-Hartman dev = MKDEV(driver->major, driver->minor_start); 332596fd7ce5SGreg Kroah-Hartman error = register_chrdev_region(dev, driver->num, driver->name); 332696fd7ce5SGreg Kroah-Hartman } 33279bb8a3d4SJiri Slaby if (error < 0) 332816a02081SJiri Slaby goto err; 332996fd7ce5SGreg Kroah-Hartman 33307e73eca6SJiri Slaby if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) { 33317e73eca6SJiri Slaby error = tty_cdev_add(driver, dev, 0, driver->num); 33329bb8a3d4SJiri Slaby if (error) 33339bb8a3d4SJiri Slaby goto err_unreg_char; 33347e73eca6SJiri Slaby } 333596fd7ce5SGreg Kroah-Hartman 333696fd7ce5SGreg Kroah-Hartman mutex_lock(&tty_mutex); 333796fd7ce5SGreg Kroah-Hartman list_add(&driver->tty_drivers, &tty_drivers); 333896fd7ce5SGreg Kroah-Hartman mutex_unlock(&tty_mutex); 333996fd7ce5SGreg Kroah-Hartman 334096fd7ce5SGreg Kroah-Hartman if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) { 334196fd7ce5SGreg Kroah-Hartman for (i = 0; i < driver->num; i++) { 334296fd7ce5SGreg Kroah-Hartman d = tty_register_device(driver, i, NULL); 334396fd7ce5SGreg Kroah-Hartman if (IS_ERR(d)) { 334496fd7ce5SGreg Kroah-Hartman error = PTR_ERR(d); 334516a02081SJiri Slaby goto err_unreg_devs; 334696fd7ce5SGreg Kroah-Hartman } 334796fd7ce5SGreg Kroah-Hartman } 334896fd7ce5SGreg Kroah-Hartman } 334996fd7ce5SGreg Kroah-Hartman proc_tty_register_driver(driver); 335096fd7ce5SGreg Kroah-Hartman driver->flags |= TTY_DRIVER_INSTALLED; 335196fd7ce5SGreg Kroah-Hartman return 0; 335296fd7ce5SGreg Kroah-Hartman 335316a02081SJiri Slaby err_unreg_devs: 335496fd7ce5SGreg Kroah-Hartman for (i--; i >= 0; i--) 335596fd7ce5SGreg Kroah-Hartman tty_unregister_device(driver, i); 335696fd7ce5SGreg Kroah-Hartman 335796fd7ce5SGreg Kroah-Hartman mutex_lock(&tty_mutex); 335896fd7ce5SGreg Kroah-Hartman list_del(&driver->tty_drivers); 335996fd7ce5SGreg Kroah-Hartman mutex_unlock(&tty_mutex); 336096fd7ce5SGreg Kroah-Hartman 33619bb8a3d4SJiri Slaby err_unreg_char: 336296fd7ce5SGreg Kroah-Hartman unregister_chrdev_region(dev, driver->num); 336316a02081SJiri Slaby err: 336496fd7ce5SGreg Kroah-Hartman return error; 336596fd7ce5SGreg Kroah-Hartman } 336696fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_register_driver); 336796fd7ce5SGreg Kroah-Hartman 336896fd7ce5SGreg Kroah-Hartman /* 336996fd7ce5SGreg Kroah-Hartman * Called by a tty driver to unregister itself. 337096fd7ce5SGreg Kroah-Hartman */ 337196fd7ce5SGreg Kroah-Hartman int tty_unregister_driver(struct tty_driver *driver) 337296fd7ce5SGreg Kroah-Hartman { 337396fd7ce5SGreg Kroah-Hartman #if 0 337496fd7ce5SGreg Kroah-Hartman /* FIXME */ 337596fd7ce5SGreg Kroah-Hartman if (driver->refcount) 337696fd7ce5SGreg Kroah-Hartman return -EBUSY; 337796fd7ce5SGreg Kroah-Hartman #endif 337896fd7ce5SGreg Kroah-Hartman unregister_chrdev_region(MKDEV(driver->major, driver->minor_start), 337996fd7ce5SGreg Kroah-Hartman driver->num); 338096fd7ce5SGreg Kroah-Hartman mutex_lock(&tty_mutex); 338196fd7ce5SGreg Kroah-Hartman list_del(&driver->tty_drivers); 338296fd7ce5SGreg Kroah-Hartman mutex_unlock(&tty_mutex); 338396fd7ce5SGreg Kroah-Hartman return 0; 338496fd7ce5SGreg Kroah-Hartman } 338596fd7ce5SGreg Kroah-Hartman 338696fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_unregister_driver); 338796fd7ce5SGreg Kroah-Hartman 338896fd7ce5SGreg Kroah-Hartman dev_t tty_devnum(struct tty_struct *tty) 338996fd7ce5SGreg Kroah-Hartman { 339096fd7ce5SGreg Kroah-Hartman return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index; 339196fd7ce5SGreg Kroah-Hartman } 339296fd7ce5SGreg Kroah-Hartman EXPORT_SYMBOL(tty_devnum); 339396fd7ce5SGreg Kroah-Hartman 339496fd7ce5SGreg Kroah-Hartman void tty_default_fops(struct file_operations *fops) 339596fd7ce5SGreg Kroah-Hartman { 339696fd7ce5SGreg Kroah-Hartman *fops = tty_fops; 339796fd7ce5SGreg Kroah-Hartman } 339896fd7ce5SGreg Kroah-Hartman 33992c9ede55SAl Viro static char *tty_devnode(struct device *dev, umode_t *mode) 340096fd7ce5SGreg Kroah-Hartman { 340196fd7ce5SGreg Kroah-Hartman if (!mode) 340296fd7ce5SGreg Kroah-Hartman return NULL; 340396fd7ce5SGreg Kroah-Hartman if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) || 340496fd7ce5SGreg Kroah-Hartman dev->devt == MKDEV(TTYAUX_MAJOR, 2)) 340596fd7ce5SGreg Kroah-Hartman *mode = 0666; 340696fd7ce5SGreg Kroah-Hartman return NULL; 340796fd7ce5SGreg Kroah-Hartman } 340896fd7ce5SGreg Kroah-Hartman 340996fd7ce5SGreg Kroah-Hartman static int __init tty_class_init(void) 341096fd7ce5SGreg Kroah-Hartman { 341196fd7ce5SGreg Kroah-Hartman tty_class = class_create(THIS_MODULE, "tty"); 341296fd7ce5SGreg Kroah-Hartman if (IS_ERR(tty_class)) 341396fd7ce5SGreg Kroah-Hartman return PTR_ERR(tty_class); 341496fd7ce5SGreg Kroah-Hartman tty_class->devnode = tty_devnode; 341596fd7ce5SGreg Kroah-Hartman return 0; 341696fd7ce5SGreg Kroah-Hartman } 341796fd7ce5SGreg Kroah-Hartman 341896fd7ce5SGreg Kroah-Hartman postcore_initcall(tty_class_init); 341996fd7ce5SGreg Kroah-Hartman 342096fd7ce5SGreg Kroah-Hartman /* 3/2004 jmc: why do these devices exist? */ 342196fd7ce5SGreg Kroah-Hartman static struct cdev tty_cdev, console_cdev; 342296fd7ce5SGreg Kroah-Hartman 3423fbc92a34SKay Sievers static ssize_t show_cons_active(struct device *dev, 3424fbc92a34SKay Sievers struct device_attribute *attr, char *buf) 3425fbc92a34SKay Sievers { 3426fbc92a34SKay Sievers struct console *cs[16]; 3427fbc92a34SKay Sievers int i = 0; 3428fbc92a34SKay Sievers struct console *c; 3429fbc92a34SKay Sievers ssize_t count = 0; 3430fbc92a34SKay Sievers 3431ac751efaSTorben Hohn console_lock(); 3432a2a6a822SKay Sievers for_each_console(c) { 3433fbc92a34SKay Sievers if (!c->device) 3434fbc92a34SKay Sievers continue; 3435fbc92a34SKay Sievers if (!c->write) 3436fbc92a34SKay Sievers continue; 3437fbc92a34SKay Sievers if ((c->flags & CON_ENABLED) == 0) 3438fbc92a34SKay Sievers continue; 3439fbc92a34SKay Sievers cs[i++] = c; 3440fbc92a34SKay Sievers if (i >= ARRAY_SIZE(cs)) 3441fbc92a34SKay Sievers break; 3442fbc92a34SKay Sievers } 3443723abd87SHannes Reinecke while (i--) { 3444723abd87SHannes Reinecke int index = cs[i]->index; 3445723abd87SHannes Reinecke struct tty_driver *drv = cs[i]->device(cs[i], &index); 3446723abd87SHannes Reinecke 3447723abd87SHannes Reinecke /* don't resolve tty0 as some programs depend on it */ 3448723abd87SHannes Reinecke if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR)) 3449723abd87SHannes Reinecke count += tty_line_name(drv, index, buf + count); 3450723abd87SHannes Reinecke else 3451723abd87SHannes Reinecke count += sprintf(buf + count, "%s%d", 3452723abd87SHannes Reinecke cs[i]->name, cs[i]->index); 3453723abd87SHannes Reinecke 3454723abd87SHannes Reinecke count += sprintf(buf + count, "%c", i ? ' ':'\n'); 3455723abd87SHannes Reinecke } 3456ac751efaSTorben Hohn console_unlock(); 3457fbc92a34SKay Sievers 3458fbc92a34SKay Sievers return count; 3459fbc92a34SKay Sievers } 3460fbc92a34SKay Sievers static DEVICE_ATTR(active, S_IRUGO, show_cons_active, NULL); 3461fbc92a34SKay Sievers 34621083a7beSTakashi Iwai static struct attribute *cons_dev_attrs[] = { 34631083a7beSTakashi Iwai &dev_attr_active.attr, 34641083a7beSTakashi Iwai NULL 34651083a7beSTakashi Iwai }; 34661083a7beSTakashi Iwai 34671083a7beSTakashi Iwai ATTRIBUTE_GROUPS(cons_dev); 34681083a7beSTakashi Iwai 3469fbc92a34SKay Sievers static struct device *consdev; 3470fbc92a34SKay Sievers 3471fbc92a34SKay Sievers void console_sysfs_notify(void) 3472fbc92a34SKay Sievers { 3473fbc92a34SKay Sievers if (consdev) 3474fbc92a34SKay Sievers sysfs_notify(&consdev->kobj, NULL, "active"); 3475fbc92a34SKay Sievers } 3476fbc92a34SKay Sievers 347796fd7ce5SGreg Kroah-Hartman /* 347896fd7ce5SGreg Kroah-Hartman * Ok, now we can initialize the rest of the tty devices and can count 347996fd7ce5SGreg Kroah-Hartman * on memory allocations, interrupts etc.. 348096fd7ce5SGreg Kroah-Hartman */ 348196fd7ce5SGreg Kroah-Hartman int __init tty_init(void) 348296fd7ce5SGreg Kroah-Hartman { 34837c0cca7cSGreg Kroah-Hartman tty_sysctl_init(); 348496fd7ce5SGreg Kroah-Hartman cdev_init(&tty_cdev, &tty_fops); 348596fd7ce5SGreg Kroah-Hartman if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) || 348696fd7ce5SGreg Kroah-Hartman register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0) 348796fd7ce5SGreg Kroah-Hartman panic("Couldn't register /dev/tty driver\n"); 3488fbc92a34SKay Sievers device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty"); 348996fd7ce5SGreg Kroah-Hartman 349096fd7ce5SGreg Kroah-Hartman cdev_init(&console_cdev, &console_fops); 349196fd7ce5SGreg Kroah-Hartman if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) || 349296fd7ce5SGreg Kroah-Hartman register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0) 349396fd7ce5SGreg Kroah-Hartman panic("Couldn't register /dev/console driver\n"); 34941083a7beSTakashi Iwai consdev = device_create_with_groups(tty_class, NULL, 34951083a7beSTakashi Iwai MKDEV(TTYAUX_MAJOR, 1), NULL, 34961083a7beSTakashi Iwai cons_dev_groups, "console"); 3497fbc92a34SKay Sievers if (IS_ERR(consdev)) 3498fbc92a34SKay Sievers consdev = NULL; 349996fd7ce5SGreg Kroah-Hartman 350096fd7ce5SGreg Kroah-Hartman #ifdef CONFIG_VT 350196fd7ce5SGreg Kroah-Hartman vty_init(&console_fops); 350296fd7ce5SGreg Kroah-Hartman #endif 350396fd7ce5SGreg Kroah-Hartman return 0; 350496fd7ce5SGreg Kroah-Hartman } 350596fd7ce5SGreg Kroah-Hartman 3506